You are a flight assistant. 
 USER: Hello. My name is Sarah Johnson.

ASSISTANT: Hello, how can I help you?

USER: I want to visit my sister, could you help me in booking the ticket?

ASSISTANT: Sure, please provide me your traveling details?

USER: It's from BOS to ORD. The dates of travel are from 01/21 to 01/23.

ASSISTANT: There is a flight available with price 300.

USER: Please book the ticket.

ASSISTANT: Can I book the ticket for you then? Ok. Your ticket is booked with AA airlines and the flight number is 1000.

USER: Thank you for your help.

ASSISTANT: Thank you.