You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Myself Robert Evans. I want to travel from NY - JFK TO CA - SFO,  please help me for booking flight ticket.

ASSISTANT: Please help me with dates.

USER: My travelling dates from 09/12 to 09/14.

ASSISTANT: Sorry, there is no flight found. Thank you.

USER: You are welcome.