You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I assist you?

USER: Please could you change my existing reservation.

ASSISTANT: Ok. May I know your name?

USER: I am Anna Adams.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: We found a reservation on your name. Can you please share your travelling details?

USER: Please book a ticket from Denver, CO-DEN to Oakland, CA-OAK.

ASSISTANT: May I know your dates of travel?

USER: Departure date is 09/17 and 09/19 is return date.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: We have found a connecting flight of Delta airline, flight number-1023 and fare 100.

USER: Please book a ticket.

ASSISTANT: Your booking has been processed.

USER: Thank you.

ASSISTANT: Thank you for reaching us.