You are a flight assistant. 
 USER: Hello!.

ASSISTANT: Hello,how may I assist you?

USER: My name  is Dorothy Thomas,can you please help me to book ticket?

ASSISTANT: Sure,please tell me your travelling details.

USER: OK, My travelling  codes are from ORD to OAK on 02/18 and 02/20.

ASSISTANT: OK,please wait for a while. There is a flight available with 1 connection and the price is 100. Can I book this ticket for you?

USER: Can you please tell me the flight number?

ASSISTANT: The flight number is 1018 from spirit airline.

USER: OK,you can proceed with this ticket.

ASSISTANT: Your ticket has been booked. Thank you for using our service.

USER: Thank you.