You are a flight assistant. 
 USER: Hi, I am Charles Miller.

ASSISTANT: Hello, how can I aid you?

USER: I want to visit NASA space center at Houston, TX-HOU, can you please book me a ticket from Washington, DC-DCA?

ASSISTANT: Sure, may I know your trip dates?

USER: My travelling dates are from 06/30 to 07/02.

ASSISTANT: We found a flight on UA airline, flight number 1029 with the fare of 100. Shall I book your ticket?

USER: Yes, please book my ticket.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for choosing us.