You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you please tell me how may I guide you?

USER: I want to book a flight on 10th Sept to visit Seattle. Can you book a flight for me?

ASSISTANT: Sure, I am here to help you with that. Could you please tell me your source airport code?

USER: My source point is OAK.

ASSISTANT: Ok, do you need a return journey ticket? If yes, please tell me the return journey date.

USER: I will return on Sept 12.

ASSISTANT: Which type of class do you prefer to travel?

USER: I want economy class.

ASSISTANT: May I know your good name please?

USER: My name is Justin Perez.

ASSISTANT: Ok, please hold on for a while.

USER: Sure. Please find me a connecting flight.

ASSISTANT: Sorry, I have not found any available flights in this route with the dates you have given.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome. Thank you for approaching us.