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

ASSISTANT: Hello. How can I serve you?

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

ASSISTANT: Sure. Please wait a while.

USER: Ok, take your time.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

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

ASSISTANT: Thank you for choosing us.