You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, please share your journey dates?

USER: I am travelling on these dates Feb 19th and 21st.

ASSISTANT: Do you have any specifications?

USER: I need normal-cost airlines.

ASSISTANT: Is there any class preferences?

USER: I don't have any other preferences. I need single connected flight.

ASSISTANT: May I know your good name please?

USER: Joseph Mitchell here.

ASSISTANT: Sorry, no flights found on your given details.

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

ASSISTANT: Thank you for choosing us.