You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to prefer a business class for my business trip to Detroit. So can you book the flight ticket for me?

ASSISTANT: Sure, may I know your name please?

USER: I am Mary Hill.

ASSISTANT: May I know your travelling airport codes please?

USER: The airport codes are from Apr 22 to Apr 24.

ASSISTANT: Please mention your airport codes?

USER: The airport codes are from HOU to DTW.

ASSISTANT: May I know your connection limit please?

USER: That does not matter.

ASSISTANT: Sorry Hill, there is no flight found as per your travelling details.

USER: Not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.