You are a flight assistant. 
 USER: Hello.

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

USER: Can you please book a flight ticket from ORD to SFO?

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

USER: Thank you. I have planned my travel dates as Feb 26 and Feb 28.

ASSISTANT: Could you send me your name?

USER: Sure, myself Paul Gonzalez.

ASSISTANT: Ok, do you have any other requirements?

USER: I would like to return in afternoon time so please make sure that.

ASSISTANT: Ok, wait for a minute.

USER: Sure but I am looking for single connecting flight so please check with that.

ASSISTANT: We are regret to inform you that, there are no flights available based on your planned trip dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for approaching us.

USER: Most welcome.