You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Ryan Walker here. 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.

ASSISTANT: Ok. Give me a moment, I will check for that. Sorry to say that there is no reservation found on your name.

USER: It's fine. Thank you for your help.

ASSISTANT: You are most welcome.