You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: I need your help in booking my ticket.

ASSISTANT: Yes, I will help you.

USER: I am planning a trip to visit my friend who stays in MSP, please book a ticket for me.

ASSISTANT: Ok, can I know your travel dates?

USER: Yes, I am planning my trip on 02/21 and my return will be on 02/23.

ASSISTANT: Can you share your current location?

USER: My origin airport code is DEN.

ASSISTANT: Ok, please wait a minute.

USER: Please proceed on the name Shirley Mitchell.

ASSISTANT: There is a no flight available.

USER: That's fine. thank you for your help.

ASSISTANT: Welcome.