You are a flight assistant. 
 USER: Hello. I am Jacob Wilson.

ASSISTANT: Hello, how can I assist you?

USER: Can you please change my existing reservation as meeting got postponed?

ASSISTANT: We found a reservation on your name. please provide your travelling dates.

USER: 11/17 and 11/19 are my travelling dates.

ASSISTANT: Let me know your airport codes.

USER: DEN and PHL are my airport codes.

ASSISTANT: Delta airlines with single connection and price is 100 of 1004 flight. Shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been confirmed with economy class.

USER: Thank you so much.

ASSISTANT: Thank you.