You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Christopher Thompson. I want to change my existing reservation, due to heavy rain fall.

ASSISTANT: Ok, I will you in that.

USER: Can you help me with it?

ASSISTANT: Sure. Please wait for a while, I will check your reservation.

USER: ok.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: No issues. Thank you.

ASSISTANT: Thank you for approaching us.