You are a flight assistant. 
 USER: Hello, I am Edward Martinez.

ASSISTANT: Hello, Edward Martinez. How can I be at your service today?

USER: I want to visit The Billy Graham library, which is known as the best library around the world, located at Charlotte, to research about ancient history. Can you help me in booking flight ticket having single halt?

ASSISTANT: I am glee to help you Edward Martinez. Can I know your airport abbreviates?

USER: I would like to travel from New York, NY - LGA, which is nearer to my location.

ASSISTANT: Do you have any price limit?

USER: I intend to return at Charlotte, NC - CLT. I will be able to spend a maximum of 200.

ASSISTANT: Ok, may I know your preferable date of journey?

USER: I want to fly on 07/09 and return on 07/11.

ASSISTANT: Ok Edward Martinez, please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting, I have tried a lot but there is no flight available on your route.

USER: Ok, not a problem. You have done a good job. Thank you for the information.

ASSISTANT: Thank you for contacting our service.