You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, May I know your good name please?

USER: I am David Lopez.

ASSISTANT: How can I aid you?

USER: I want to cancel my recent reservation due to Science exhibition were cancelled.

ASSISTANT: Sure, I will help you with that. Please wait a minute.

USER: Ok.

ASSISTANT: Thank you for waiting. I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

USER: Not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us, Have a great day.