You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What service do you need from us?

USER: Sarah Johnson here, can you please help me to cancel my reservation which I did a week ago?

ASSISTANT: Sure, I can help you with the ticket cancellation process.

USER: Thank you for your support.

ASSISTANT: Please give me a minute, I will check your ticket status and let you know.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you, there is no reservation found with your name in our database.

USER: That's ok, may be the reservation is not confirmed. Thank you for trying your best.

ASSISTANT: Yes, I think that is the reason. Thank you for contacting us.