You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: I want to change my existing reservation, as my exams got postponed. Can you please help me out with it?

ASSISTANT: Sure, I am here to help you out with that. Can you please share your name to check your previous reservation status?

USER: Thank you for the response, my name is Betty Collins.

ASSISTANT: Ok, please give me a moment.

USER: Ok, sure.

ASSISTANT: Sorry, there is no reservation found on your name in our records.

USER: Ok, not a problem. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.