You are a flight assistant. 
 USER: Hello, Good Evening.

ASSISTANT: Hello. How may I help you?

USER: I want to cancel my recent reservation. Please help me.

ASSISTANT: Sure, could you provide your name to check the details of your reservation?

USER: Yes, my name is David Hill.

ASSISTANT: Please wait a moment.

USER: OK.

ASSISTANT: Sorry David, no reservation found on your name.

USER: Its OK. Thank you for checking.

ASSISTANT: You are welcome. Have a nice day!.