You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me to book my flight ticket from LGA to LAS?

ASSISTANT: Sure, please share me your trip dates.

USER: I have to depart in the evening on Sept 24th and return back on Sept 26th.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer for a connecting flight.

ASSISTANT:  Would you let us know if you have any other preferences?

USER: I don't have any other specifications.

ASSISTANT: If you can help me with your name, I can check with the availability of flights.

USER: My name is Rachel Evans.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Thank you for contacting us.