You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I render you today?

USER: Sarah Martin here.

ASSISTANT: Ok.

USER: I would like to cancel my recent reservation, can you help me with this?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure.

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, thanks for your help and information.

ASSISTANT: Thank you for choosing us.