You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I am Carolyn Rodriguez. Could you please book a flight ticket in economy class to OAK?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: I want to depart on 22nd May and return on 24th May.

ASSISTANT: Ok, may I know your origin location airport code?

USER: My origin is from LGA.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: Ok, not a problem. Thank you for the information.

ASSISTANT: You are welcome, have a great day.