You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I need your guidance in booking a flight ticket. Could you?

ASSISTANT: I will help you with that. Can you please share on what dates you are willing to travel?

USER: August 23 and 25 are my planned travel dates.

ASSISTANT: Do you have any airline preferences?

USER: Please check for a business class airlines.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: OAK and EWR are my in and out airport codes.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: I am comfortable with any flight.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: Nothing much to state.

ASSISTANT: Can you please provide your name to proceed further?

USER: My name is Catherine White.

ASSISTANT: Sorry, there are no flights available at your request.

USER: That's ok. Thank you.

ASSISTANT: Thank you for contacting us, have a nice day.