You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Stephanie Lewis.

ASSISTANT: How can I assist you today?

USER: I need to travel Las Vegas, can you please reserve flight ticket from IAH and LAS?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: My travelling dates are Dec,20 and Dec,22.

ASSISTANT: May I know your class preference?

USER: I don't need any class preference.

ASSISTANT: Do you have any time concerns?

USER: I need a single connection for my travel. My return time should be in the evening.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: UA airlines is providing a flight on that route with ticket fare of 200 and 1 connection, it's departure time is 11 AM and return time is 21 PM. Shall I proceed for booking?

USER: Please proceed with the reservation.

ASSISTANT: I have successfully booked you an economy class ticket in flight-1015, have a safe journey.

USER: Thank you reserving my flight ticket.

ASSISTANT: Thank you for choosing us.