You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Sharon Miller. I want to cancel my recent reservation. Could you help me with that?

ASSISTANT: Sure, please wait a moment, let me with your details in our database.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry, there are no active reservations to cancel your ticket.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching our service.