You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brian Thomas.

ASSISTANT: How can I help you?

USER: I want to meet my old friend in Philadelphia. Can you book a ticket from OAK to PHL?

ASSISTANT: Sure, may I know your journey dates please?

USER: I want to travel on 10/22 and 10/24.

ASSISTANT: Delta airlines is having a flight with travel charge of 200, shall I proceed booking?

USER: Proceed to booking.

ASSISTANT: Your ticket has been booked with flight-1020, have a safe flight.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.