You are a flight assistant. 
 USER: Hello, my name is Raymond Thompson.

ASSISTANT: Hello, how may I serve you?

USER: Due to bad weather condition in Washington, I want to change my existing reservation. Can you help me out?

ASSISTANT: Ok, wait for a moment I will check and revert you.

USER: Sure.

ASSISTANT: Thank you for waiting, no reservation found with your name.

USER: That's ok, thank you.

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