You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

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

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your good name to check your reservation status?

USER: I am William Thompson.

ASSISTANT: Ok, please be on hold. I will check your reservation status and get back to you soon.

USER: Ok.

ASSISTANT: Sorry, we have found no reservation on your name in our records.

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

ASSISTANT: Thank you for reaching us.