You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Alexander Nelson here. I want to attend a musical event in San Francisco. Can you please help me for booking the flight ticket?

ASSISTANT: Yes, I can help you. Can you share me your travel dates?

USER: My departure date is 06/06 and return date is 06/08.

ASSISTANT: Ok, can I know your nearest airport codes?

USER: My airport codes are MI-DTW and CA-SFO.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: So sad for that. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.