You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you?

USER: I am heading from Denver to visit national gallery of art at Washington. Can you help me book a flight ticket within the fare of 1000?

ASSISTANT: Sure. May I know your travelling dates?

USER: I intend to leave on 08/14 and return on 08/16.

ASSISTANT: Can you share your airport codes?

USER: My codes of airport are DEN and IAD.

ASSISTANT: May I know your good name?

USER: Steven Jones is my name.

ASSISTANT: There is a flight 1009 in AA airline and price 100 with a connection. Shall I proceed?

USER: Ok, you can book my ticket with this airline.

ASSISTANT: Ok, Your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.