You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I'm Eric Brown, planning to book a flight ticket from NY- JFK to CA- SFO.

ASSISTANT: It' nice Eric. Let me know your travel dates please.

USER: Sure. My preferable travelling dates are from 12/14 to 12/16.

ASSISTANT: Please give me a moment, let me check the flight details.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry Eric, no flight has matched with your dates.

USER: It's Ok. Thank you for your help.

ASSISTANT: Your welcome. Thank you for reaching us. Have a good day.