You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I would like to visit Las Vegas to meet my friend, please help me in booking a ticket from ORD to LAS.

ASSISTANT: Sure, may I know your planned trip dates?

USER: My planned travel dates are on June 24 and June 26.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: May I know your arrival and depart timings?

USER: I would like to return in the evening.

ASSISTANT: May I know your good name to proceed further?

USER: My name is Richard Lee.

ASSISTANT: Sorry, there are no flights found on your specified travel dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for availing us.