You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I need to book a flight ticket from PHL to SFO, Can you please help me for booking?

ASSISTANT: May I know your desired travel dates please?

USER: I would like to travel on 08/24 to return on 08/26.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: May I know your name please?

USER: Linda Smith here.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for opting us.