You are a flight assistant. 
 USER: Hi. Lisa Wilson here.

ASSISTANT: Hello. How can I help you today?

USER: I would like to prefer a direct flight for my business trip to Charlotte. Can you book a flight ticket for me?

ASSISTANT: Sure, please share your planned travel dates?

USER: The trip dates are from 22 July to 24 July.

ASSISTANT: Can I have your boarding point?

USER: The airport codes are from MSP to CLT.

ASSISTANT: Any other preferences?

USER: No.

ASSISTANT: Sorry Lisa Wilson, no flights found with your given details.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.