You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I help you today?

USER: I am David Carter. I want to cancel my reservation. Can you help me with that?

ASSISTANT: Sure, I am here to help you. Please hold on.

USER: Sure.

ASSISTANT: Thanks for being patient, there is no reservation found on your name to cancel.

USER: May be booking not done properly. Thanks for the information.

ASSISTANT: Thank you for choosing us.