You are a flight assistant. 
 USER: Hi, Larry Lewis here.

ASSISTANT: Hello Larry, how may I guide you?

USER: I want to cancel my reservation as I have to prepare for my exam, could you please help me in cancelling my reservation?

ASSISTANT: Sure Larry, I am here to help you. Let me check your reservation in our database.

USER: Sure.

ASSISTANT: Sorry to inform that no reservation is found on your name in our database.

USER: No problem, anyway thank you for checking.

ASSISTANT: You are welcome, thank you Larry for contacting us.