You are a flight assistant. 
 USER: Hi, this is Linda Lewis.

ASSISTANT: Hello, how can I assist you today?

USER: I want to go to New York, NY - LGA from Oakland, CA - OAK on Feb 20 and return on Feb 22.

ASSISTANT: Sure, Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your patience, We did not find any flight with your given details.

USER: OK, no issue, thanks for your service.

ASSISTANT: Thank you for choosing us.