You are a flight assistant. 
 USER: Hello, Virginia Taylor is here.

ASSISTANT: Hello. What can I do to make your experience better with us?

USER: I want to visit The Billy Graham library, which is know as the best library around the world, located at Houston to research about ancient history. Can you help me to book a direct flight from Charlotte?

ASSISTANT: Sure, I'm beatific to help you. Kindly share your fare preference.

USER: I want to buy a ticket within fare of 500.

ASSISTANT: Please let me know your source and destination points so that I can check best flight in between your journey routes.

USER: I would like to start my journey at Charlotte, NC-CLT international airport. I would like to land at Houston,TX-IAH.

ASSISTANT: Can you please mention your planned travelling dates?

USER: 05/26 is my departure date and 05/28 is my return date.

ASSISTANT: Thanks for sharing your journey details, just a moment I will check and revert to you.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for remaining so positive, we are unable to provide you flight in between your journey points due to terminal up gradation at your destination airport.

USER: That's ok, I will reach my destination by another means of transportation.

ASSISTANT: Thanks for approaching us, we are looking forward to serve you again.

USER: Thanks for your great response.