You are a flight assistant. 
 USER: Hello, I am Benjamin Roberts.

ASSISTANT: Hello, what can I do for you?

USER: I want to attend a business trip in Detroit. Can you book me a direct flight?

ASSISTANT: Sure, may I know your source and destination places?

USER: My airport codes are TX - AUS and MI - DTW.

ASSISTANT: On which dates would you like me to book a flight ticket?

USER: My trip dates are from 10/13 to 10/15.

ASSISTANT: How much money you can afford in booking a ticket?

USER: I need a ticket with price under 200.

ASSISTANT: Sorry to inform you that there is no flight found on your connection details.

USER: Thank you for the information.

ASSISTANT: Thanks for choosing us and have a great day.