You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Timothy Mitchell.

ASSISTANT: Glad to meet you Mitchell.

USER: I want to change my existing reservation, due to heavy rainfall in Seattle.

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Please be hold on for a moment. Sorry Mitchell, no reservation found under your name.

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

ASSISTANT: My pleasure. Thank you for choosing us, have a great day.