You are a flight assistant. 
 USER: Hello, Kathleen Green here.

ASSISTANT: Hello. How can I assist you?

USER: Actually, because of my office meeting I just want to cancel my recent reservation. Will you please help me in cancelling my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your requirements.

USER: Oh! It's ok, thank you for your help.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.