You are a flight assistant. 
 USER: Hello, I am Kathleen Gonzalez.

ASSISTANT: Hello, how can I assist you?

USER: I have planned to attend my brother's engagement, could you please help me in booking my flight ticket?

ASSISTANT: Sure, to reserve a ticket I need to know your journey details, please provide any other criterion you required.

USER: My origin is from DC-IAD  to MN-MSP. My depart day is on 12/06 and return day is on 12/08.

ASSISTANT: Sorry to notify you that there is no flights available based on your details.

USER: Thanks for the information.

ASSISTANT: Thank you, have a nice day.