You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: David Turner here.

ASSISTANT: How may I help you?

USER:  I want to attend a music event in Minneapolis.Can you book a ticket from CLT to MSP?

ASSISTANT: Sure, can I know your trip dates?

USER: This weekend on 02/26 and return on 02/28.

ASSISTANT: Sorry David, there is no flight for your requirement. Thank you to visit us.

USER: That's fine, thanks for your help.