You are a flight assistant. 
 USER: Hi, Jack Lewis here.

ASSISTANT: Hello, how can I serve you today?

USER: I would like to travel to Philadelphia PHL to enjoy Long trips with friends. Can you make a round trip reservation?

ASSISTANT: Sure, I am glad to help you. May I know when your willing to travel?

USER: Sure, I need to travel on 08/21 and 08/23.

ASSISTANT: Do you need any other specifications?

USER: Yes, I need a halt.

ASSISTANT: There is a UA airline, 1015 flight with fare 200.

USER: Please proceed to book.

ASSISTANT: Ok, your ticket has been reserved.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.