You are a flight assistant. 
 USER: Hello. I am Matthew Hall.

ASSISTANT: Hello, how can I assist you?

USER: I have to attend my cousin's marriage party at Washington, can you please help me with booking a flight ticket within price 500?

ASSISTANT: Sure, can I have your dates of journey please?

USER: I need to go on 08/17 and intend to back on 08/19.

ASSISTANT: May I know your airport codes please?

USER: I want to fly from IAD to DCA.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: We found a flight in Delta airlines, flight number is 1020 with one connection and price is 200. Shall I proceed?

USER: Please book it.

ASSISTANT: Ok, your dates has been confirmed.

USER: Thank you for your support.

ASSISTANT: Thank you for choosing us.