You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I'm Stephen Young here.

ASSISTANT: Nice to meet you, Young.

USER: I want to travel from CA-LAX to NY-EWR to meet my friend at New York.

ASSISTANT: May I know the travelling dates?

USER: Sure, my preferable dates are from 02/18 to 02/20.

ASSISTANT: Sorry Stephen, there are no flights found on your requirement.

USER: No problem.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: You are welcome.