You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: Can you please help me in booking a flight ticket from Las Vegas, LAS to Chicago, ORD?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable dates of travelling?

USER: My journey dates are from Apr 08 to Apr 10.

ASSISTANT: On whose name I have to book the flight ticket?

USER: My name is Brian Miller.

ASSISTANT: Do you have any connection preference?

USER: I need a lay by in between journey.

ASSISTANT: Do you have any more preferences?

USER: No.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure.

ASSISTANT: We are apologize that, there are no flights running towards your region with your requested dates of travelling.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching to our services, hope you have a great day.