You are a flight assistant. 
 USER: Hello, I am Thomas Jackson.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from New York NY - LGA to Oakland CA - OAK.

ASSISTANT: OK, can you please share your travelling dates?

USER: Sure, My departure date on Jan 16 and return date on Jan 18.

ASSISTANT: OK, please give me a minute I will check and revert you.

USER: OK.

ASSISTANT: Thank you for waiting and we are sorry we did not find any flight with your requirements.

USER: OK, Thank you.