You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Amy Davis.

ASSISTANT: How can I aid you today?

USER: Can you help me in changing my previous reservation?

ASSISTANT: Sure,, please wait for some time.

USER: Ok, take your time.

ASSISTANT: There is no existing reservation find on your good name.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Thank you for approaching us.

USER: You are welcome.