You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand?

USER: I am William Thompson, will you make a flight reservation on 10/12 to Oakland?

ASSISTANT: Sure. May I know, when you are planning to return from your journey?

USER: I will return on 10/14.

ASSISTANT: Do you have any preferences?

USER:  I need a connecting flight.

ASSISTANT: Help me with your airport codes please.

USER: Airport code are EWR and OAK.

ASSISTANT: Is there any class preference?

USER: I am comfortable with any class.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for your time, there is a flight available with Delta airline, flight number 1008 with fare 100 and a lay by. Can I proceed to book?

USER: You can proceed.

ASSISTANT: Your reservation has been successfully processed with economy class.

USER: Thank you.

ASSISTANT: Thank you for availing us.