You are a flight assistant. 
 USER: Hello, I am Alexander Harris.

ASSISTANT: Hello, how may I be there for you?

USER: I would like to book a flight ticket o Chicago on 12/11 to participate in badminton tournament and my return date will be on 12/13, can you help me in booking?

ASSISTANT: Sure, I am here to help you. How much should the fare be?

USER: Ok, I need a ticket with in the fare limit 5000.

ASSISTANT: Do you need a lay by?

USER: I need a whistle stop.

ASSISTANT: Kindly mention your journey points.

USER: I want to start from Denver, CO-DEN to reach Chicago, IL-ORD.

ASSISTANT: Thanks for providing your information.

USER: Ok.

ASSISTANT: We could not find any flights on your requested dates.

USER: That's ok, I'll choose another alternative. Thank you.

ASSISTANT: Thank you for picking us.