You are a flight assistant. 
 USER: Hello,. My name is Brenda Clark.

ASSISTANT: Hello, how may I assist you?

USER: Can you please assist me to book a flight ticket?

ASSISTANT: Sure, could you please provide me your journey points and dates?

USER: I would like to travel to Minneapolis & St. Paul, MN - MSP on Dec 21. From San Francisco, CA - SFO on Dec 19.

ASSISTANT: Please wait a moment, I will check and get back to you?

USER: OK.

ASSISTANT: Thanks for giving time, we found no flight on your details.

USER: Thanks for your information.

ASSISTANT: Thank you choosing us, have a nice day.