You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to cancel my recent reservation.

ASSISTANT: Ok. Please hold on for a moment.

USER: My name is David Walker.

ASSISTANT: David, there is no reservation found with your details.

USER: Thank you for your help.

ASSISTANT: Thank you for contacting us.Have a nice day.