You are a flight assistant. 
 USER: Hello, Samuel Jones here.

ASSISTANT: Hello. How may I help you?

USER: Due to heavy traffic, I have missed my flight. Is this possible to cancel my ticket?

ASSISTANT: Yes, please hold on for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found with the given name. I believe your reservation has already been cancelled.

USER: Ok. Thank you for your help.

ASSISTANT: Thank you for reaching us.