You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Christine Brown here.

ASSISTANT: Brown, how may I aid you today?

USER: Can you cancel my flight ticket reservation?

ASSISTANT: Sure, I will help you with that, please hold on for a moment to check your reservation status.

USER: Ok.

ASSISTANT: Brown, I did not find any reservation with your name in my database.

USER: Ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.