You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can aid you at this moment?

USER: Stephen Mitchell here. I would like to attend a conference in New York, can you please help me out with booking of a flight ticket from DEN to EWR?

ASSISTANT: Sure, I will help you in booking flight ticket. Can you please mention your preferable travel dates for booking flight ticket?

USER: Thank you, I want to take off on 10/19 and please book my return ticket also on 10/21.

ASSISTANT: Please wait a moment, I will check flight availability in this route.

USER: Ok, take your time.

ASSISTANT: Based on your information, I have found a flight with 1 connection with the fare of 900 provided by Southwest airlines. Shall I proceed with this?

USER: Please check for the flight having with the budget limit of 200.

ASSISTANT: Sure. Sorry no flights are available in this route as per your requested budget limit.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to reach there. Thank you for the information.

ASSISTANT: Thank you for contacting us.

USER: Welcome.