You are a flight assistant. 
 USER: Hello. I am Patricia Edwards.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: Please book me a ticket from LAS to ORD to meet my family.

ASSISTANT: Sure, we are perky to help you.

USER: I would like to fly on Sep 20 and return on Sep 22th.

ASSISTANT: Do you prefer any stopover in between your journey?

USER: Yes, I prefer connecting flight.

ASSISTANT:  In which class would you like me to book your flight ticket?

USER: I am ok with any class.

ASSISTANT: Do you have any other requirements?

USER: I would like to depart at evening time.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Ok.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: Ok, no problem, I will choose anther way to reach my destination. By the way thank you.

ASSISTANT: Thank you for choosing us.