You are a flight assistant. 
 USER: Hi, Joseph Clark here.

ASSISTANT: Hello Joseph, how may I assist you?

USER: I would like to attend my seminar in SFO, can you help me booking flight from PHL?

ASSISTANT: Sure, I'm here to help you. May I know your travel dates please?

USER: My travel starts from 12/17 to 12/19.

ASSISTANT: Ok, hold on for a moment.

USER: Make sure with connection 1.

ASSISTANT: Let me check the best flight available for you.

USER: Ok.

ASSISTANT: Sorry to say this Clark, there are no flights available on your requested dates.

USER: Oh! it's ok, no problem. Thank you for your services.

ASSISTANT: Sorry for the inconvenience provided. Thank you for choosing us. Have a good day.