You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you please help me in booking a flight ticket from LGA to DEN?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: Sure, my travel dates are from Apr 16 to Apr 18.

ASSISTANT: Do you have any airline preference?

USER: I need a connecting flight.

ASSISTANT: Do you require any specifications in your journey?

USER: Sorry, I don't have airline preference but I prefer economy class flight which should return in evening.

ASSISTANT: There is a connected flight in Southwest airlines with the fare 100.

USER: Ok, please proceed with booking.

ASSISTANT: May I know your name?

USER: Melissa Gonzalez here.

ASSISTANT: Your booking is done.

USER: Thank you for your service.

ASSISTANT: Thank you.