You are a flight assistant. 
 USER: Hi, I am Thomas Allen.

ASSISTANT: Hello,. How may I assist you?

USER: Please reserve a seat to Washington, DCA.

ASSISTANT: Please provide journey dates?

USER: 09/11-09/13 are the preferable dates to travel.

ASSISTANT: Please provide origin airport code?

USER: Origin is Houston, HOU, I will start from here to attend the comic con show.

ASSISTANT: Ticket can be booked with airline UA, connections 1, flight number 1008 having price 100.

USER: You can confirm my seat.

ASSISTANT: Ticket is booked.

USER: Thank you.

ASSISTANT: Thank you.