You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. May I know your good name, please?

USER: I am Benjamin Parker. I want to travel  from San Francisco, CA-FSO on 08/30 to meet my grand daughter.

ASSISTANT: Thanks for providing the information.

USER: Could you please help me in booking a flight ticket?

ASSISTANT: May I know your depart and return dates along with destination airport code? May I know, Is the origin CA - FSO or CA - SFO?

USER: Sure, My destination is to  Charlotte, NC-CLT  and return on 10/02. It is CA-SFO.

ASSISTANT: Thank you for your response.

USER: Departure is 09/30.

ASSISTANT: We found that, there are no flights available for your travel dates.

USER: Thank you for the information.

ASSISTANT: Thank you, for your effort to approach us for the booking process. Have a nice day.