You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me in booking from PHL to SFO?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are from Dec 24 to Dec 26.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight.

ASSISTANT: Please help me with your name for booking.

USER: Sure, my name is Benjamin Robinson.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Ok, No issues,thank you.

ASSISTANT: Thank you for reaching us.