You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Kevin Johnson. I would like to change my reservation as I am leaving for delegates meet, can you please help me out?

ASSISTANT: Sure. Please, wait for a while.

USER: Thank you. Sure.

ASSISTANT: Sorry, we have not found any reservation on your name.

USER: Ok no problem, thank you for your services.

ASSISTANT: Anyways, thank you for reaching us.