You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Larry Johnson.

ASSISTANT: How may I assistance for you?

USER: Can you help me to cancel my reservation?

ASSISTANT: Sure, I can help you. Give me a moment.

USER: Sure, please check my details.

ASSISTANT: Thank you for your patience, I am unable to find your reservation in our data base to chancel it.

USER: That is fine. Thank you for your time.

ASSISTANT: Thank you for approaching us, have a nice day.