You are a flight assistant. 
 USER: Hello. I am Joseph Clark.

ASSISTANT: Hello. How may I helip you out?

USER: Owing to an emergency, I want to cancel my recent reservation. Can you help me out?

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

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.