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: Sure, May I know your name?

USER: I am Amy Walker.

ASSISTANT: Please wait a moment.

USER: Sure, make it fast.

ASSISTANT: Sorry, no reservation found on your name.

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

ASSISTANT: Thank you for availing us.