You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Due to an emergency meeting, I am unable to travel the trip which I have planned, can you please change my recent booking?

ASSISTANT: Sure, can I know your name please?

USER: Sure, I am Jason Smith.

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

USER: That's fine, no issues with that one.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your immediate response.

ASSISTANT: Welcome.