You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me with the cancellation of my existing reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Can I have your name to check the reservation status?

USER: I am David Gonzalez.

ASSISTANT: Just a minute, please.

USER: Sure.

ASSISTANT: Thank you for your time, I could not find any reservation on your name to cancel.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for choosing us.