You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Michael Lewis here. One of my friend is invite me to attend a VIVA Awards event.Can you please help me for booking a ticket?

ASSISTANT: Sure, help me with the starting and ending dates of journey. And also the origin and destination airport code.

USER: My departure date is 06/21 and return date is 06/23. My airport codes are from MN-MSP to CA-SFO. Make sure my connections limit is 0.

ASSISTANT: Sorry, there is no flight with 0 connection.

USER: Ok, thank you for the information.

ASSISTANT: Welcome.