You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me in booking a flight ticket from ORD to PHL?

ASSISTANT: Sure. As an agent, I can help you. May I know your name?

USER: I am Robert Green.

ASSISTANT: Thank you. Can I know your travel dates?

USER: I want to travel on 01/28, and return on 01/30.

ASSISTANT: Noted. Please let me know your class preference.

USER: I am comfortable with any class.

ASSISTANT: Ok, do you have any other specifications?

USER: I need a break in my journey.

ASSISTANT: Noted. Please wait, let me check for the available flights.

USER: Sure.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: You are welcome and thank you for choosing us.