You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Catherine Harris here.

ASSISTANT: Harris, how may I assist you today?

USER: Can you cancel my flight ticket reservation?

ASSISTANT: Sure, I will help you with that, please hold on for a moment.

USER: Ok.

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

USER: Ok, not a problem. Thank you.

ASSISTANT: It's my pleasure, have a nice day.