You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I am William Anderson. I need to visit Lyndon Baines Johnson library at Austin. Can you book me a flight ticket?

ASSISTANT: Sure, I will help you in that.

USER: Thank you.

ASSISTANT: When did you planned to visit Lyndon Baines Johnson library?

USER: I want to travel on 04/18, and need to catch return flight on 04/20.

ASSISTANT: Thanks for providing your dates we need some more details also, please share me your airport codes?

USER:  I need to leave from my nearest airport HOU to reach AUS.

ASSISTANT: We found a flight on your details with airline Spirit, flight number: 1026. Shall I book this ticket with economy flight?

USER: Proceed with the booking.

ASSISTANT: Your ticket has been booked.

USER: Thanks for the help.

ASSISTANT: Thank you so much.