You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Susan Parker.

ASSISTANT: How may I assist you?

USER: Could you please book a flight ticket to Denver on Apr 16 with a connecting flight?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: I need to catch a return flight on Apr 18.

ASSISTANT: May I know your origin airport code please?

USER: Denver airport code is DEN. My origin is from MCO.

ASSISTANT: Susan Parker, there are no flights available in your route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.