You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Melissa Green.

ASSISTANT: How may I aid you?

USER: Due to some business meeting I am going to cancel my reservation. Could you please help me for cancelling my reservation?

ASSISTANT: Sure, I am here to help you.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry Green, we did not find any reservation on your name in our records.

USER: Not a problem, thank you very much for your help.

ASSISTANT: Thank you for approaching us.