You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to cancel my recent reservation, as most of my friends are not coming for the vacation. Can you please help me with this?

ASSISTANT: Sure, on which name can I find your reservation?

USER: I am Paul Johnson.

ASSISTANT: No reservation found in our database.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for choosing us.