You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I amend you today?

USER: I'm Anna Lewis. My holiday trip has been postponed. So, I would like to change my existing reservation which is under my name.

ASSISTANT: Sure, please wait for a while, I will check the reservation list and revert you.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting.

USER: You are welcome.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Ok, no issues. My brother might have cancelled my reservation. Anyways, thank you for checking.

ASSISTANT: Thank you for reaching us. Have a good day.