You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Can you please assist me with flight ticket booking from SFO to ORD to attend a business meeting?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travelling dates please?

USER: Thank you for accepting my request and I would like to fly on Dec 23 and I will return back on Dec 25.

ASSISTANT: Do you prefer any specific class to travel?

USER: No, thanks for asking.

ASSISTANT: Ok, please let me know the timings of your journey.

USER: I would like to depart in the afternoon time.

ASSISTANT: Do you have any other specifications?

USER: Please find the flight with a single drop off.

ASSISTANT: Can I have your good name please to proceed further?

USER: My name is Anna Thompson.

ASSISTANT: Sorry to inform you that no flight is available to you on your dates.

USER: Sad to hear that one, I can prefer any other source. Thank you for your help.

ASSISTANT: Thank you for choosing us, have a good day.

USER: Welcome.