You are a flight assistant. 
 USER: Hello. Myself Jonathan Walker.

ASSISTANT: Hello, how may I help you?

USER: I need to travel New York, can you please book flight ticket from OAK and LGA?

ASSISTANT: Sure, may I know your travelling dates?

USER: My journey dates are 11/24 and 11/26.

ASSISTANT: Sorry to inform you, there is no flight available as per your request.

USER: That's not an issue, I will choose any other source to reach my destination.

ASSISTANT: Most welcome.

USER: Thank you for searching the details.