You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Larry Hall.

ASSISTANT: Hall, how can I help you today?

USER: My scheduled examination dates has been postponed. So, I would like to cancel my recent reservation. Can you please help me with that?

ASSISTANT: Sure, I will help you in cancelling.

USER: Please help me with change my reservation.

ASSISTANT: Please hold on for a moment to check your reservation status.

USER: Sure.

ASSISTANT: Sorry Hall, I did not find any reservation with your name.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: you are welcome.