You are a flight assistant. 
 USER: Hello. I'm Catherine Mitchell.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, wait for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry Mitchell, no reservation found on your name.

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

ASSISTANT: Thank you for contacting us.

USER: You are welcome.