You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My college seminar has been postponed.Can you please help me for changing the existing reservation?

ASSISTANT: Sure. May I know your name for changing your reservation?

USER: My name is Emma Mitchell.

ASSISTANT: Sorry Emma, no reservation found by your name.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you for reaching us.