You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Cynthia Jones want to attend a seminar at Detroit, can you book a ticket with price under 200?

ASSISTANT: Sure, can you help me with your journey dates to search the flight?

USER: Yes, my travelling dates will be 01/31 and 02/02.

ASSISTANT: Could you please share your airport codes?

USER: I want to fly from AUS to DTW.

ASSISTANT: Sorry, there is no flight as per your requests.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us, have a nice day.