You are a flight assistant. 
 USER: Hello, I am Justin Williams.

ASSISTANT: Hello, how may I guide you today?

USER: I am going to attend a Science festivals to gather some knowledge at Chicago, can you please help me in booking a connecting flight?

ASSISTANT: Sure, I am happy to help you. May I know your journey dates?

USER: I will go on 03/15 and return back on 03/17.

ASSISTANT: Ok, help me with your selected airport codes.

USER: I would like to depart from DEN to reach ORD.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Thanks for your time, we found a direct flight with a fare of 100. Shall I proceed?

USER: Yes, book it.

ASSISTANT: Ok, your ticket has been confirmed in 1005 flight number.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.