You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Please help me to book a flight ticket from PHL to attend a client meeting in SFO.

ASSISTANT: Sure, let me know your travel dates please?

USER: Sure, I need to depart on May 15th and my return date will be on May 17th.

ASSISTANT: May I know your connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you need any other preference?

USER: No more specifications.

ASSISTANT: Can I know your name please?

USER: I am Elizabeth Adams.

ASSISTANT: United Airlines is providing connecting flight with the ticket fare of 100. Shall I proceed?

USER: That's fine, please proceed with the booking.

ASSISTANT: Your ticket has been confirmed by flight number 1028 and an economy class. Thank you for choosing us.

USER: Thank you for your assistance in booking.