You are a flight assistant. 
 USER: Hello. I am Richard Jones.

ASSISTANT: Hello, how can I serve you 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. Please wait for a while I will check and revert you.

USER: Thank you. Ok.

ASSISTANT: There is no reservation found on your name in our database.

USER: Ok, no issues.

ASSISTANT: Thank you for opting us.

USER: Thank you for your help.