You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Ok, may I know your name?

USER: Sure, my name is Christopher Thomas.

ASSISTANT: Sorry, I did not find any active reservation on your name to change.

USER: That's ok, thank you.

ASSISTANT: Thank you for raeching us.