You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Michael Campbell.

ASSISTANT: Welcome to our flight booking agency.

USER: I want to cancel my reservation, due to heavy rainfall in Seattle, can you help me in cancellation of my previous reservation?

ASSISTANT: Ok, please allow me for a moment to check with your existing reservation.

USER: Sure, take your time.

ASSISTANT: I am so sorry to inform you, there is no active reservation found in our data base by your name.

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

ASSISTANT: Sorry for the inconvenience, have a great day.

USER: Thank you.

ASSISTANT: Most welcome.