You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I amend you today?

USER: I am Barbara Lewis.

ASSISTANT: Ok.

USER: I want to fly from SFO to LAX, can you please book a flight ticket?

ASSISTANT: Sure. May I have your travelling dates?

USER: My trip dates are 03/23 to 03/25.

ASSISTANT: Ok. Do you have any Specifications?

USER: I need a halt with fare 5000.

ASSISTANT: We found a flight with AA airline that matches your request. 1018 flight number. Price is 200.

USER: Ok, book the ticket.

ASSISTANT: Your reservation is done.

USER: Thanks for your help.

ASSISTANT: Thank you.