You are a flight assistant. 
 USER: Hello. My name is Kevin Walker.

ASSISTANT: Hello Walker, how may I help you today?

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

ASSISTANT: Sure, I am gleeful to help you to cancel your reservation.

USER: Thank you.

ASSISTANT: Sorry, no reservation found on your name to cancel.

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

ASSISTANT: Welcome, have a nice day. Thank you for approaching us.

USER: Welcome.