You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Frank Hill, I would like to change my recent reservation, can you help me?

ASSISTANT: Ok, wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found with your name to change it.

USER: That's fine, thanks for your information.

ASSISTANT: Thanks for consulting us.