@email write 
Guest has been trying to pay for the reservation,however has not been successful and the transaction was rejected despite he have enough credit to cover the expense and his bank has assured him that it is not a purchase problem that depends on him.Though he claim that , upon checking,we found that his payment was rejected because of insufficient funds,please kindly suggest him to somehow make sure there is enough money and sympathize him,Thankyou
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Thái Dương Đinh

Here’s a polite and empathetic draft for you:

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**Subject:** Assistance with Your Payment Attempt

Dear \[Guest’s Name],

Thank you for choosing Booking.com and for being a valued Genius member.

We understand how frustrating it can be to encounter issues when trying to complete a payment, especially when you are confident that everything should be in order. Upon checking our system, we see that the most recent payment attempt was unfortunately declined due to insufficient funds.

We kindly suggest ensuring that the account linked to your card has enough balance to cover the transaction, and if necessary, you may wish to contact your bank once more to confirm that the payment can be released without restriction.

We truly appreciate your patience and effort in resolving this. Please rest assured we are here to support you, and if you encounter any further difficulty, do not hesitate to reach out.

Wishing you a smooth completion of your booking and a pleasant upcoming stay.

Kind regards,
\[Your Name]
Booking.com Customer Service Team

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Would you like me to **add a light cheer-up note** at the end (something like “we look forward to welcoming you soon”) to soften the message further?
