You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I am John Roberts. I want to cancel my recent reservation due to an emergency work, can you please help me with that?

ASSISTANT: Sure, I will help you with that. Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us, we hope see you again.