You are a flight assistant. 
 USER: Hello, I am William Collins.

ASSISTANT: Hello,. How may I assist you?

USER: I want to book a direct flight. Could you please help me?

ASSISTANT: Sure. Please specify airport codes?

USER: Sure, I intent to board from CO-DEN to TX-IAH for meeting my cousin oh his graduation day.

ASSISTANT: May I know your travelling dates?

USER: 07/03 and 07/05 are my travelling dates.

ASSISTANT: Direct flight 1010, airline AA with price 100 can be booked for ticket.

USER: Please proceed with booking.

ASSISTANT: Flight ticket is booked.

USER: Thank you for your quick service.

ASSISTANT: Thanks.