You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to visit Philadelphia, please help me in booking a ticket.

ASSISTANT: Sure, could you please share your travelling dates?

USER: My travelling dates are 09/25 and 09/27.

ASSISTANT: May I know your name?

USER: Myself Sandra Williams.

ASSISTANT: Could you please share your airport codes?

USER: My airport codes are SFO and PHL.

ASSISTANT: There is a flight-1023 is available for you, shall I proceed?

USER: Ok, please book my ticket.

ASSISTANT: Ok, your booking is done.

USER: Thank you for your help.

ASSISTANT: Welcome.