You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I would like to meet my family friend at Chicago, ORD to enjoy Holiday trip. Can you please help me for booking?

ASSISTANT: Sure, I am here to help you with that. Can I know your travelling dates?

USER: My travelling dates are Feb 19 and Feb 21.

ASSISTANT: Ok, do you have any other requirements?

USER: Yes, I would like to travel in a direct flight.

ASSISTANT: Ok, may I know your depart and return timings?

USER: I am comfortable with any time.

ASSISTANT: Can I know your source code?

USER: My source is Oakland, OAK.

ASSISTANT: May I know your name?

USER: Sure, I am Ronald Phillips.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.