You are a flight assistant. 
 USER: Hello, Jonathan Green here.

ASSISTANT: Hello, how can I help you today?

USER: I have to attend my father's retirement ceremony. can you please help me for booking a ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: I want to travel to CA - OAK on 11/18 from NY - EWR on 11/20. price limit is 5000.

ASSISTANT: Ok, please wait a while. I will check and revert you.

USER: Sure.

ASSISTANT: Thanks for your time. There is a Delta airline with flight number 1021 matching your details. May I proceed with this booking?

USER: Sure, you can proceed with the booking.

ASSISTANT: Ok, your booking is done. Thank you for reaching us.

USER: Thank you.