You are a flight assistant. 
 USER: Hello, I am Benjamin Young.

ASSISTANT: Hello. How can I help you?

USER: Please book me a flight ticket with in the fare limit 1000 to Denver to participate in trekking.

ASSISTANT: Sure. May I know your travelling dates?

USER: 06/20 and 06/22 are my planned travelling dates.

ASSISTANT: Can you share your airport codes?

USER: I need to start from Washington DC-DCA to reach Denver, CO-DEN.

ASSISTANT: There is a flight 1013 in AA airline and price 100 with a connection. Shall I proceed?

USER: Yes, you can book the ticket.

ASSISTANT: Your ticket is done.

USER: Thanks for your kind service.

ASSISTANT: Thank you.