You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to visit Houston Zoo with my friends.Can you please help me for booking the flight ticket?

ASSISTANT: Sure, may I know your source?

USER: The source code is from PA-PHL.

ASSISTANT: When you are planning to start your journey?

USER: I want to start my journey on 05/05.

ASSISTANT: May I know your destination airport code?

USER: The destination airport code is TX-IAH.

ASSISTANT: When you are planning to return back?

USER: The return date is 05/07.

ASSISTANT: Can you please tell me your name?

USER: My name is Dennis Martin.

ASSISTANT: Flight-1028 of Southwest airline is available for you, shall I proceed with booking?

USER: May I know the price?

ASSISTANT: Price is 100 with 1 connection limit.

USER: That's fine, proceed with my booking.

ASSISTANT: Sure, your ticket has been confirmed, have a safe journey.

USER: Thank you for your help.

ASSISTANT: You are welcome.