You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Could you help me in booking a flight ticket from OAK to PHL?

ASSISTANT: Sure. Let me know your travelling dates.

USER: I want to fly on Oct 22, return on Oct 24.

ASSISTANT: Do you have any preference?

USER: I want a flight with one connection.

ASSISTANT: Can I know your name?

USER: My name is Christopher Smith.

ASSISTANT: Direct flight is found with Delta airlines for price 100 having flight number 1020.

USER: Ok, proceed to booking.

ASSISTANT: Ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you.