You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kathleen Lewis.

ASSISTANT: How can I help you today?

USER: I want to book a ticket from IAD to LAS to attend workshop, can you help me in booking?

ASSISTANT: Sure, I am happy to help you. When are you willing to travel?

USER: I am departing on Apr 18 and return on Apr 20.

ASSISTANT: Do you have any stopover in between journey?

USER: I need a flight with connection limit 1.

ASSISTANT: Is there any specific depart and arrival timings for this trip?

USER: I want to return in afternoon time.

ASSISTANT: Can you please let me know your class specification?

USER: I am ok with any class.

ASSISTANT: Would you like to travel in an normal-cost airline or low-cost airline?

USER: I am ok with any airlines.

ASSISTANT: Thanks for providing details, we found a connecting flight in Delta airline with a fare of 100 which departs at 21:00 PM and return at 16:00 PM. Shall I proceed for booking?

USER: Please proceed for booking.

ASSISTANT: Ok, your ticket is reserved in an economy class and the flight number is 1019.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.