You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I abet you?

USER: I am Jason Campbell. Meeting family got preponed, so I intend to change my reservation.

ASSISTANT: Ok, that's what I am here.

USER: Thank you.

ASSISTANT: Please hold on a moment. I will check the airline data and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry to say that there was no reservation found on your name in airline data.

USER: No problem. Thank you.

ASSISTANT: Thank you for approaching us.