You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I help you today?

USER: I want to visit Madison Square garden this vacation. Can you book me a ticket?

ASSISTANT: Sure. Can you provide your full journey details please?

USER: I will depart on 04/16 and arrive on 04/18. My source is CA-LAXI, will depart to  NY-LGA.

ASSISTANT: Ok, please wait for a minute, I will check and let you know.

USER: Ok.

ASSISTANT: May I know your name please.?

USER: I am Robert Taylor.

ASSISTANT: Unfortunately, there are no flights found for your journey.

USER: OK, thank you for the service.

ASSISTANT: Thanks for contacting us.