You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Myself Jonathan Lopez. I want to go Oakland next week  to meet my friends there, can you please book a flight ticket from Washington?

ASSISTANT: Sure Lopez, can I know the travel dates please?

USER: My departure date is 07/28 and please book my return ticket also on 07/30.

ASSISTANT: Could you please provide the airport codes?

USER: I would like to take off from IAD and destination airport is OAK.

ASSISTANT: Ok, wait a moment please.

USER: Ok.

ASSISTANT: There is a flight in Delta airline with price 100, can I book it?

USER: Please book this flight ticket for me.

ASSISTANT: Your ticket has been booked with flight number 1019.

USER: Thank you for your help.

ASSISTANT: Thank you for approaching us.