You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I need to travel JFK and LAX, can you reserve flight ticket?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My travelling dates are Dec,04 and Dec,06.

ASSISTANT: Ok, could I have your name please?

USER: Myself Samuel Martinez.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I prefer one connecting flight.

ASSISTANT: Ok, do you have any other specifications?

USER: I need normal-cost airlines.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey.

ASSISTANT: You are welcome, have a great day.