You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, please for a moment I will check your details and get back to you.

USER: Sure, please check the reservation on the name of Joseph Collins.

ASSISTANT: Sure. Sorry to say, I did not found any details regarding your reservation.

USER: Ok, no problem.

ASSISTANT: Thanks for contacting us. Have a nice day.

USER: Thank you for your help.