You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Karen Roberts.

ASSISTANT: How can I assist you at this moment?

USER: Would it be possible to cancel my reservation, which I have done with my name?

ASSISTANT: Sure, I will help you with this. Please give me a moment to check your reservation status.

USER: Ok.

ASSISTANT: Karen Roberts, I have searched the database with your name in our database and I couldn't find any active reservation under your name.

USER: That's ok. Thank you for the information.

ASSISTANT: Thank you for utilising our service.