You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donald Clark.

ASSISTANT: How can I help you?

USER: I want to book a ticket from NV - LAS to NY - EWR.

ASSISTANT: Sure,Let me know your journey details?

USER: Departure Feb/18 , Return Feb/20.

ASSISTANT: OK,you will wait for a moment I will check and let you know?

USER: OK.

ASSISTANT: Thanks for your patience.Your flight number is 1018 and class is:Economy ,Airline is:Spirit.

USER: OK.

ASSISTANT: Do you  have any  other requirements?

USER: I have a price limit 200 with one connection limit.

ASSISTANT: We have providing flight with one connection.

USER: OK, You can proceed to that.

ASSISTANT: OK. Your flight ticket is confirmed.

USER: OK. Thank you.