You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you today?

USER: Can you help me cancel my reservation which was made on the name of Joseph Clark?

ASSISTANT: Sure, I'll try to cancel your ticket. Please wait a moment I will check the reservation list.

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: That's fine, thank you.

ASSISTANT: Thank you for reaching us.