You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Can you book a flight ticket on my name Sarah Hall to DCA?

ASSISTANT: Sure, I will help out in booking the ticket.

USER: Thank you.

ASSISTANT: May I know your departure airport code please?

USER: My source region is IAH and I have to land on DCA.

ASSISTANT: Can I know your travelling dates please?

USER: My travelling dates are on 06/30 and back after my work on 07/02.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

USER: Yes, please confirm my flight.

ASSISTANT: Ok, your ticket has been booked with flight number 1006.

USER: Thank you so much for your help.

ASSISTANT: Thank you for choosing us.