You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to celebrate my birthday at DTW, can you please book me a ticket from OAK?

ASSISTANT: Sure, may I know your planned dates of travel?

USER: My travel dates are from Dec 24th to Dec 26th.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Do you have any specifications?

USER: I want a normal-cost airline. I want a lay by in between my journey.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: We found an airline Hawaiian with flight 1020 having a lay by with fare 200. Shall I proceed with booking?

USER: Please book a ticket on the name of Brenda Hill.

ASSISTANT: Ok, your booking has been done.

USER: Thank you for your assistance.

ASSISTANT: Thank you for opting us.