You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I made a reservation earlier to attend for a seminar but, it has been postponed. Can you help me for changing my existing reservation?

ASSISTANT: Sure, we are euphoric to help you. May I know your name to check with the earlier reservation?

USER: Sure, I am Jason White.

ASSISTANT: Ok, Jason White. Please be on hold, to check with the reservation on your name to change.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for being hold. Sorry to say that, there was no reservation found on your specified name.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for consulting our agency.