You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Emily Robinson.

ASSISTANT: Emily, how can I help you today?

USER: There is an invitation from White House for an event, so I want to book a ticket from Houston.

ASSISTANT: Emily, can you please provide us your journey dates?

USER: I am departing on 10/13 and return on 10/15.

ASSISTANT: Emily, may I know your airport codes?

USER: My departure airport is Houston-HOU and destination airport is Washington DCA airport.

ASSISTANT: Emily, please wait for a while.

USER: Sure.

ASSISTANT: Emily, there is a flight in UA airlines and the ticket costs you 100 only. Can I book the ticket?

USER: I am ok with United airlines, please proceed for booking.

ASSISTANT: Emily, your ticket is booked successfully with the flight-1002.

USER: Thank you for your help.

ASSISTANT: Emily, thank you for choosing us and happy journey.