You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I be of your assistance today?

USER: Can you book a flight ticket to Chicago, ORD from Las Vegas, LAS?

ASSISTANT: Sure, we are here to help you. Do you have any limitations in your travel?

USER: Yes, please provide with one connecting flight.

ASSISTANT: When you want to start your journey to ORD?

USER: I will travel on 12/24 to attend the baby shower program on 12/25 of my sister's baby.

ASSISTANT: When you are willing to come back?

USER: I will return on 12/26.

ASSISTANT: May I know your name?

USER: Robert Hall is my name.

ASSISTANT: Thanks for providing me your name Robert Hall.

USER: Ok.

ASSISTANT: There is no flight found on your locations.

USER: Ok. Thank you for your kind service.

ASSISTANT: Thank you for  opting us. Have a cheerful day!.