You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Linda Smith here.

ASSISTANT: Linda Smith, how may I assist you today?

USER: I would like to meet my brother at Phoenix, please help me in booking a ticket from DEN to PHX.

ASSISTANT: Sure, I will help you. Please help me with your planned travel dates.

USER: My planned travel dates are on Feb 11 and Feb 13.

ASSISTANT: Please let me know with your preferred depart and depart time.

USER: I would like to depart in the evening.

ASSISTANT: Do you need a direct or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Please help me with your preferred class to fly.

USER: Any class is comfortable for me.

ASSISTANT: Do you have any other preferences in your journey?

USER: No more preferences.

ASSISTANT: We have a connecting flight operated by Frontier Airlines with a fare of 100. Is it ok for you?

USER: Ok, please proceed for booking.

ASSISTANT: I have booked your ticket in flight-1001. It departs at 21 PM.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us. Have a great time.