You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: Can you please help me to cancel my reservation?

ASSISTANT: Sure, may I know your name to check with the reservation list and revert you?

USER: Myself David Young.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: We could not find any reservation by the name you provided.

USER: Ok, no problem. Thank you so much.

ASSISTANT: Thank you for picking us.