You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please confirm a seat to Chicago, ORD?

ASSISTANT: Sure. May I know your starting point?

USER: Las Vegas is my source point.

ASSISTANT: When do you want to travel?

USER: I would like to travel on 06/17 to participate in bike race.

ASSISTANT: May I know your Las Vegas airport code?

USER: Sure, it's LAS, Las Vegas.

ASSISTANT: When do you want to return back?

USER: I am planning to return on 06/19.

ASSISTANT: Sorry, there are no flight found on your preferred dates.

USER: Thank you for sharing the information.

ASSISTANT: May I know you name, please?

USER: I am Nancy Williams.

ASSISTANT: Thank you for choosing us.

USER: Ok, Thank you.