You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you today?

USER: Please book a ticket from Las Vegas to New York for science festival.

ASSISTANT: Sure, we are here to help you. Could you please provide Las Vegas and New York airport codes?

USER: Ok. Airport codes are LAS and EWR.

ASSISTANT: How much you can afford for this journey?

USER: Price limit 200.

ASSISTANT: Please help me with your departure and arrival dates.

USER: Sure. Departure date is 10/14 and 10/16 is my return.

ASSISTANT: May I know your good name?

USER: I am Paul Wright.

ASSISTANT: Sorry, no flights found on your requested travelling dates.

USER: Thanks for your help.

ASSISTANT: Thank you for connecting with us.