You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I'm Andrew Miller. I want to go on a vacation to Washington.can you book a ticket from TX - IAH to DC - DCA?

ASSISTANT: OK, when would you like to travel?

USER: I want to depart on 04/26 and return on 04/28.

ASSISTANT: I have a found a flight as per your request.

USER: The connection limit is 1.

ASSISTANT: Flight number 1011 from Hawaiian airline matches with you, with a cost of 200 only. Shall I proceed for booking?

USER: Yes.

ASSISTANT: OK, your ticket has been booked successfully.

USER: Thank you for your help.

ASSISTANT: Thank you, have a safe journey.