You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to visit Lake Merritt in Oakland on 01/28 to 01/30.Can you please help me out?

ASSISTANT: Sure, may I know your preferable airport codes?

USER: The airport codes are from CA-OAK to NY-LGA.

ASSISTANT: Ok, may I know your name?

USER: Sure, my name is Rachel Carter.

ASSISTANT: Sorry Carter, no flight's found on your request.

USER: That's no problem. Thank you for your information.

ASSISTANT: Thank you for your contacting us.