You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Stephen Nelson.

ASSISTANT: How can I aid you for this day?

USER: I am planning to attend an art exhibition in PHL. Can you book a ticket from my city LAS?

ASSISTANT: Ok, can you please tell me your travelling dates?

USER: My preferable dates are from 09/29 to 10/01.

ASSISTANT: As per your information, there is a flight with price 100 and flight number is 1023.

USER: Good, please book my ticket.

ASSISTANT: Ok, your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for contacting us.