You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: Can you book me a flight ticket from DEN to MCO?

ASSISTANT: Sure, please share me your planned journey dates?

USER: I am planning to start on Sept 11 and return on Sept 13th.

ASSISTANT: Do you want a connecting flight?

USER: Yes.

ASSISTANT: Is there any other requirement?

USER: I would like to prefer an economy class.

ASSISTANT: May I know your good name?

USER: I am Richard Roberts.

ASSISTANT: Thank you for the details, sorry there is no flight found on your given journey data.

USER: That's alright, thanks for your assistance.

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