You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I support you for the day?

USER: Please change my existing reservation owing to an emergency.

ASSISTANT: Ok. May I know your name to check reservation?

USER: I am Dennis Lewis.

ASSISTANT: Please, wait for a moment. Thank you for being patience.

USER: Sure.

ASSISTANT: We found a reservation with your name.Please share your new journey details.

USER: Please book a ticket from Oakland, CA-OAK to Chicago, IL-ORD.

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are from 11/03 to 11/05.

ASSISTANT: Do you need lay by in between your journey?

USER: Connections limit 1.

ASSISTANT: Thank you for your time, there is a flight available with JetBlue airline, flight number 1000 with fare 400 and a lay by. Shall I proceed to book?

USER: Please do not book a ticket.

ASSISTANT: Ok.

USER: Thank you.

ASSISTANT: Thank you for reaching us.