You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Due to an emergency work, I want to change an existing reservation. Can you help me on this?

ASSISTANT: Ok, may I know your name?

USER: My name is Ronald Allen.

ASSISTANT: Ok. please wait a moment.

USER: Sure.

ASSISTANT: We found a reservation in your name. Could you please provide your new journey details?

USER: I would like to start from SEA on 12/19 to JFK on 12/21.

ASSISTANT: Please provide your destination code.

USER: Please check provided with dates.

ASSISTANT: Sorry, please wait a moment.

USER: Sure.

ASSISTANT: Delta airlines with single connection and price is 200 of 1016 flight. Shall I proceed for booking?

USER: Please carry on.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thanks for choosing us.