You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Please help me to book a flight ticket in the month of  May from 11th to 13th.

ASSISTANT: Sure, can you please share your airport codes?

USER: My airport codes are DFW to MSP.

ASSISTANT: Do you have any connection limit?

USER: I would prefer a direct flight for this journey.

ASSISTANT: May I know your airline preference?

USER: No, I don't have any other specifications.

ASSISTANT: May I know your name please?

USER: Gregory Martin here.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.