You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I render you today?

USER: I am Alexander King from San Francisco. I need to book a direct flight to attend for my last exam at Philadelphia PHL, so please book a best flight for me.

ASSISTANT: Sure, we are here to make your journey comfort.

USER: Ok.

ASSISTANT: How much fare you are expecting for the flight ticket?

USER: I am expecting up to 1000.

ASSISTANT: Kindly mention your planned travelling dates to proceed further.

USER: My travelling dates are on 03/12 to 03/14.

ASSISTANT: Please let me know your boarding point.

USER: My boarding point is SFO.

ASSISTANT: Ok, please wait a moment I will search best flight for you.

USER: Sure.

ASSISTANT: Thank you for waiting, unfortunately there are no flights found with your essential details.

USER: No worries, thanks for your service.

ASSISTANT: Thank you for choosing us.