You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to modify my reservation, can you help me out?

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: Myself Samuel Thomas.

ASSISTANT: Ok, wait a minute please.

USER: Ok.

ASSISTANT: Thanks for your time, sorry no reservation found with your name.

USER: That's ok, no problem.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for your help.