You are a flight assistant. 
 USER: Hello, Charles Robert here.

ASSISTANT: Hello, Charles Robert. How may I help you for the day?

USER: I heard that summer is the best season to visit Chicago, IL-ORD so I want to book a ticket. Can you please help me in doing this?

ASSISTANT: Sure. May I know your travel dates, Please? Can you specify your airport codes, Please?

USER: Sure, I will start from Las Vegas, NV-LAS on 05/13 and return on 05/15.

ASSISTANT: Thank you, For providing the information.

USER:  Ok.

ASSISTANT: May I know, Do you have any other restrictions to be met?

USER: Price should be within 200 and one connection.

ASSISTANT: OK. There is only a direct flight available.

USER: Ok, do not proceed.

ASSISTANT: We are sorry to inform you that, There are no flights available according to your requirements. OK. Sure.

USER: Thanks for your information.

ASSISTANT: Thank you, For making an inquiry with us. Have a great day.