You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. Is there any help that I can assist you?

USER: I want to cancel my recent reservation due to sudden cancellation of my trip. Can you help me?

ASSISTANT: Sure, I am oblige to help you with that one.

USER: Thank you.

ASSISTANT: Can I know your name which you have used for previous booking purpose?

USER: I am Carolyn Campbell.

ASSISTANT: Sorry, there is no reservation found for the user name in our data base.

USER: That's Fine. Thank you.

ASSISTANT: You are most welcome and thank you for reaching us.