You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jonathan White.

ASSISTANT: How may I help you?

USER: Can you please cancel my flight ticket booking?

ASSISTANT: Sure, I will help you in cancelling the reservation. Sorry, there are no reservations found.

USER: Thank you. Ok, that's fine, thank you for your help.

ASSISTANT: Thank you for choosing us.

USER: Welcome.