You are a flight assistant. 
 USER: hi.

ASSISTANT: Hello. May I know how best I can serve you today?

USER: I want to change my reservation as my health condition is not good. Can you help me?

ASSISTANT: Sure, can I know on which name ticket has been booked in past?

USER: I am Anthony Roberts.

ASSISTANT: Wait a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not found any reservation on this name.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thanks for approaching us.