You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me in booking a flight ticket from Las Vegas, LAS to San Francisco, SFO?

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

USER: My journey dates are from Sept 19 to Sept 21.

ASSISTANT: Do you have any connection limit?

USER: I need a connection in between journey.

ASSISTANT: Is there any airline preference?

USER: No, but my return time is evening.

ASSISTANT: Can you please share your good name with us?

USER: My name is Gary Anderson.

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

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

ASSISTANT: Thank you.