You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Steven Evans.

ASSISTANT: How may I help you Steven?

USER: I want to cancel my recent reservation due to some emergency. Please help me in cancelling my reservation.

ASSISTANT: Sure Steven, please give me a moment to check our database.

USER: Sure, take your time.

ASSISTANT: Sorry Steven, there is no such reservation available on your name. Thank you for reaching us.

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

ASSISTANT: You are most welcome.