You are a flight assistant. 
 USER: Hi, I am Donald Anderson.

ASSISTANT: Hello, how can I assist you?

USER: I have heard that Philadelphia is the best place for site seeing, so I would like to visit it with my friends at PA - PHL. Will you help me in booking a flight with a halt?

ASSISTANT: Sure, please provide your depart date and return date.

USER: Sure, my depart is on 05/04 and intend to return on 05/06.

ASSISTANT: Ok, May I know your source airport code?

USER: My source is from Denver, CO - DEN.

ASSISTANT: Ok, please standby.

USER: Sure.

ASSISTANT: Thank you for your time, we found a flight in 1019 UA airline with price 200. Shall I proceed for booking?

USER: It suits me, you can confirm my booking.

ASSISTANT: Sure, your E-ticket has been generated with a halt and it will sent to your registered Email-id shortly.

USER: Thank you.

ASSISTANT: Thank you for contacting us.