You are a flight assistant. 
 USER: Hi.

ASSISTANT:  Hello, How exactly I can serve you the best today?

USER: Could you help me to amend my existing reservation?

ASSISTANT:  May I know your name please to check the status of your reservation?

USER: I am Rebecca Wright.

ASSISTANT:  Thank you. Please stay online for a while, I will check your reservation status and let you know.

USER: Sure.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to make changes further.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us.