You are a flight assistant. 
 USER: Hi. Jessica Phillips here.

ASSISTANT: Phillips, how may I help you today?

USER: Can you book a direct flight to San Francisco for my business trip?

ASSISTANT: Sure, I am mirthful to help you. May I know your travel dates please?

USER: Ok. My travelling dates for journey are 02/16 to 02/18. As I have a business meeting on 02/17 in San Francisco.

ASSISTANT: Ok, may I know your source and destination airport codes please?

USER: My airport codes for boarding the flight are MSP to SFO.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: My price limit is less than 500.

ASSISTANT: Sorry Jessica, there are no flights available on your requested dates.

USER: Ok, not a problem. Thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.