You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, I can help you. May I know your name?

USER: My name is Lisa White.

ASSISTANT: Thank you. Please wait for a while, let me check your reservation status.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: Ok, not a problem. Thank you.

ASSISTANT: You are welcome and thank you for choosing us.