You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My father is a veteran in army, he want to visit the vietnam veteran memorial. So, please a book from IAH to DCA.

ASSISTANT: That's great to hear. Will you provide your travelling dates?

USER: Travel dates are this weekend on 11/04 and return date is 11/06.

ASSISTANT: Mention your father name for booking the ticket.

USER: Ashley Taylor here.

ASSISTANT: As per your request, there is a flight with price 100 and the connections 1. Shall I proceed for booking?

USER: Proceed for booking.

ASSISTANT: Your ticket is booked.The flight number is 10021. Sorry the flight number is 1001.

USER: Thanks for your help.

ASSISTANT: Thank you for reaching us.Have a great day.