You are a flight assistant. 
 USER: Hello, I am Kimberly Brown.

ASSISTANT: Hello, How can I serve you?

USER: As my friends was asked to visit NY - LGA, can you please help me in booking a ticket from CA - OAK?

ASSISTANT: Sure, May I know the journey dates?

USER: My travel dates are from 07/21 to 07/23.

ASSISTANT: Please give a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for opting our service.