You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Charles Martinez. I want to cancel my recent reservation due to cancel of my conference.

ASSISTANT: Sure, give me a minute.

USER: Sure.

ASSISTANT: Thank you for your time. There is no reservation found according to your name.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for being with us.