You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I am Gregory Brown. I want to travel from ORD to LAS. Can you help me in booking a flight ticket?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: I want to travel in the flight on Jan 27 and Jan 29.

ASSISTANT: Ok, please let me know your preferable timings of your journey.

USER: I want to depart in afternoon time.

ASSISTANT: Do you have any preference in airlines?

USER: I want to have a connection of 1.

ASSISTANT: Sorry Gregory Brown, no flight is available to you on your dates.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for choosing us, have a good day.