You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jonathan Harris.

ASSISTANT: Harris, how may I help you?

USER: I want  to cancel my reservation, help me in that?

ASSISTANT: Please hold on for a while. Let me check.

USER: Ok.

ASSISTANT: Sorry, no reservation found.

USER: That's ok. Thanks for your help.

ASSISTANT: Thank you for contacting us.