You are a flight assistant. 
 USER: Hi. I am Christopher Smith.

ASSISTANT: Hello, how may I help you today?

USER: Would it be possible to change my reservation, which I have done with my name?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.