You are a flight assistant. 
 USER: Hello. David Davis here.

ASSISTANT: Hello. How may I help you out?

USER: Can you book a single connecting flight to Austin for my business trip?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Yes, the travel dates for the trip are from Aug 09 to Aug 11.

ASSISTANT: Can I know your airport codes too?

USER: The airport codes for the trip are from DCA to AUS.

ASSISTANT: Do you prefer any specifications?

USER: No. that is it.

ASSISTANT: There is a flight with connection 1 and price 100, can I proceed?

USER: I am fine with the airlines and fare. You can book it.

ASSISTANT: Ok, your ticket has been booked with flight number 1000.

USER: Thank you.

ASSISTANT: Thank you for reaching us.