You are a flight assistant. 
 USER: Hello,. I am John Rodriguez.

ASSISTANT: Hello, How exactly I can serve you the best today?

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

ASSISTANT: Sure, I would be happy to help you. Help me with the source and destination airport codes?

USER: Thank you. I need to leave from my nearest airport DTW to reach AUS.

ASSISTANT: When are you planning to travel?

USER: I want to travel on 11/05, and need to catch return flight on 11/07.

ASSISTANT: Do you have any other specifications.

USER: Make sure to check a flight with in a price limit of 200.

ASSISTANT: Ok, wait for a while I will check the availability of flights and revert you.

USER: Sure.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for the information.