You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you today?

USER: I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you please help me in changing my reservation?

ASSISTANT: Sure, I'll help you in changing an existing reservation. Could you please let me know your name to check the reservation details?

USER: Myself Jack Phillips.

ASSISTANT: Ok, please wait a moment. Thank you for waiting, sorry to inform you that there is no reservation found by this name.

USER: Ok. That's fine, thank you.

ASSISTANT: Thank you for approaching us.