You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Benjamin King here,  I do not want to travel in the flight which I booked previously. I heard from many people that the airlines is not giving good service, can you help me to do some modifications?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry King, there is no reservation found with your name to change your reservation.

USER: Ok, please recheck it once again, I have faced this problem previously also.

ASSISTANT: I have rechecked it again but there is no reservation.

USER: Ok, no issue, Thank you for confirmation.

ASSISTANT: Thank you for choosing us.