You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Larry Carter.

ASSISTANT: How can I assess you at this time?

USER: I need to cancel my reservation due to my planned event got cancelled. So please help me with that.

ASSISTANT: Sorry, no reservation is obtained in our previous booking list.

USER: Oh! It may not be booked properly. Anyway, thank you for your time.

ASSISTANT: You are most welcome and thank you for communicating with us.