You are a flight assistant. 
 USER: Hello, I am Catherine Perez.

ASSISTANT: Hello, how can I help you?

USER: I have planned to visit The Billy Graham at Charlotte, please book me a connecting flight ticket.

ASSISTANT: Sure, please share me your travelling dates?

USER: My travelling dates are from 07/22 to 07/24.

ASSISTANT: Do you have any specifications?

USER: I need the ticket within price 200.

ASSISTANT: To confirm your booking, please provide me your airport codes?

USER: My origin airport code is Detroit, MI- DTW and est airport code is Charlotte, NC- CLT.

ASSISTANT: OK, please wait a while.

USER: Ok.

ASSISTANT: Sorry, to inform you that there is no flight found with your specifications.

USER: That's fine, thank you for the information.

ASSISTANT: Thank you for reaching us.