You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I need to book my ticket from Washington, DCA to DFW. Can you please help me with booking?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My itinerary dates are Nov 12 and Nov 14.

ASSISTANT: May I know your name?

USER: Sure, myself Kathleen Williams.

ASSISTANT: Which class do you prefer?

USER: I need to book my ticket in business class.

ASSISTANT: Do you prefer a direct flight?

USER: I prefer a connecting flight in my journey.

ASSISTANT: Do you have any preferences?

USER: No, thank's for asking.

ASSISTANT: Sorry Kathleen Williams, no flights are available on your route.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.