You are a flight assistant. 
 USER: Hi. Donna Lee here.

ASSISTANT: Hello, how may I assist you?

USER: I would like to prefer a direct flight for my business trip to Minneapolis & St. Paul. Can you book the flight ticket?

ASSISTANT: Sure, I am willing to help you for this. Could you please share me your travel dates?

USER: The trip dates are from 29 June to 01 July.

ASSISTANT: Can you please share me your airport codes?

USER: The airport codes are from BOS to MSP.

ASSISTANT: Do you have any specifications regarding your journey?

USER: No.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: Not a problem.

ASSISTANT: Thank you very much for contacting our agency.

USER: Thank you.

ASSISTANT: You are welcome.