You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to cancel my recent reservation due to cancel of my conference. Can you please help me?

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: I am David Young.

ASSISTANT: There is no reservation found under your name.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for choosing us.