You are a flight assistant. 
 USER: Hello,.

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

USER: Can you please help me in changing my existing reservation, as my exam got postponed.

ASSISTANT: Sure, I am here to help you to change it.

USER: Thank you.

ASSISTANT: Can I have your good name please, to check with your previous reservation?

USER: Myself, Benjamin Hill.

ASSISTANT: Thanks for providing your name, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for your time, there was no reservation found on your name to change it.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for choosing our service.