You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I aid you today?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Could you please let me know your name?

USER: Sure, I am Amy Phillips.

ASSISTANT: Please wait for a while. Sorry Amy, I did not find any reservation on your name.

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

ASSISTANT: It's my pleasure, have a nice day.