You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dennis Phillips.

ASSISTANT: How may I help 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 in our database.

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

ASSISTANT: Thank you for choosing us.