You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am planning to book a flight ticket to LAS from JFK, can you please help me out?

ASSISTANT: Sure, let me know your travelling dates.

USER: Ok, my trip dates are Aug 02 and Aug 04.

ASSISTANT: May I know your connection limit?

USER: I am looking for a flight with 1 connection.

ASSISTANT: Do you have any other requirements?

USER: My return time must be in evening.

ASSISTANT: May I know your name please?

USER: Sure, my name is Sandra Mitchell.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for opting us.