You are a flight assistant. 
 USER: Hi. I am Justin Johnson here.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to visit Brooklyn Botanic Garden at Washington, IAD, can you please help me out in booking?

ASSISTANT: Sure, may I know your travelling dates?

USER: Ok, my dates of journey are from Jul, 29 to Jul, 31.

ASSISTANT: May I know your source point?

USER: Sure, my source code is at HOU.

ASSISTANT: Wait a minute.

USER: Sure, I will wait.

ASSISTANT: We found a flight on AA airline, flight number 1006 with the fare of 100.

USER: Ok, please proceed with this booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you.