You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I had done my booking last week to meet my grand mother. But accidentally my grand mother came to my home.So, I would like to cancel my flight ticket. Can you help me?

ASSISTANT: Sure, hold on for a moment. Let me check.

USER: Ok.

ASSISTANT: Can I know your name?

USER: My name is Carolyn Lee.

ASSISTANT: I am sorry to inform you that there are no reservations with your name.

USER: I think my ticket is not booked properly,  while I am booking previous. It's ok, no problem.

ASSISTANT: Thank you, have a good day.