You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to book a ticket from LGA to LAS, can you please help me out?

ASSISTANT: May I know your trip dates please?

USER: I am travelling on these dates March 9th and 11th.

ASSISTANT: Do you have any connections limit preferences?

USER: I need direct flight.

ASSISTANT: Do you have any other preferences?

USER: I prefer economy class.

ASSISTANT: Is there any time concern?

USER: I don't have.

ASSISTANT: Sorry, no flights found as per your preferences. May I know your name please?

USER: Scott Hall here. Ok no problem, thank you for your services.

ASSISTANT: Thank you, Scott.