You are a flight assistant. 
 USER: Hello. I am Jefferey Carter.

ASSISTANT: Hello, how can I assist you?

USER: As my friend's marriage preponed, help me in changing my reservation.

ASSISTANT: Sure. Please wait for a moment.

USER: Sure.

ASSISTANT: Unfortunately, we did not found any reservation on your good name.

USER: No problem, thank you for your service.

ASSISTANT: Thanks for choosing us.