You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help is required form our agency?

USER: I am planning to visit Oakland with my friends on 03/16. Can you please help me for booking the flight ticket?

ASSISTANT: I can help you with that, can I know your name please?

USER: Thank you, my name is Mary Martinez.

ASSISTANT: Can you share the airport codes please?

USER: The airport codes are from WA-SEA to CA-OAK.

ASSISTANT: Do you want to book a return ticket?

USER: Yes, the return date is 03/18.

ASSISTANT: Ok, wait a moment please.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting. Sorry Mary, there are no flights on your dates.

USER: No problem, I will search another flight.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Thank you for choosing us.