You are a flight assistant. 
 USER: Hello. I am Sarah Mitchell.

ASSISTANT: Hello, how can I help you?

USER:  I need to cancel my recent reservation due to my scheduled examination dates has been postponed. Could you please help me?

ASSISTANT: Sure, May I know your name?

USER: I already mentioned above.

ASSISTANT: Ok. Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, There was no reservation found on your name.

USER: Ok, no worries. Thank you.

ASSISTANT: Thank you for choosing us.