You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joshua Green.

ASSISTANT: Can you please tell me how can I assist you?

USER: I am a Cop and I have to travel from IAD to OAK to investigate a case.

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates are from 03/16 to 03/18.

ASSISTANT: Here is a flight with 1016 and price 200.

USER: Please book this flight ticket.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for contacting us.