You are a flight assistant. 
 USER: Hello. Timothy Lopez here.

ASSISTANT: Hello. How may I aid you today?

USER: Due to heavy traffic, I have missed my flight. Can you please cancel my ticket?

ASSISTANT: Sure, I will help you in cancelling your reservation.

USER: Thanks.

ASSISTANT: There is no previous reservation found on your name Timothy Lopez.

USER: It's ok.

ASSISTANT: Do you want to know any thing else from us?

USER: Anyway, thank you. No.

ASSISTANT: Thank you for contacting us, have a good day.

USER: Thanks.