You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: As my friends are already booked a ticket with them, I would like to cancel my reservation. Can you help me with cancelling my reservation?

ASSISTANT: Sure, we are happy to help you.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: Sure, I am Charles Lewis.

ASSISTANT: There is no reservation on your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thanks for choosing us.