You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Thompson.

ASSISTANT: How may I help you now?

USER: I want to cancel my reservation, as my exam is postponed. Can you help me?

ASSISTANT: Sure, I can help you top cancel. Sorry, no reservation is placed with your name. Thanks for reaching us, have a nice day.

USER: No issue, thank you for your time.