You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: I am Charles Green, I would like to cancel my recent reservation, can you help me?

ASSISTANT: Sure, I will help you in cancelling your reservation. Please be on hold for a moment while I check your reservation status.

USER: Sure, take your own time.

ASSISTANT: Charles Green, I have searched the database with your name and I couldn't find any active reservation with your details.

USER: That's fine, thanks for your information.

ASSISTANT: Thank you for opting us.