You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Due to some important work in my office, I want to postponed my trip. Can you please change my recent reservation?

ASSISTANT: Please provide your name.

USER: I am Stephanie Turner.

ASSISTANT: Please provide your travelling details that you want to change.

USER: I would like to travel from OAK to ATL to enjoy with my friend in Oakland.

ASSISTANT: Please provide your travelling dates.

USER: My preferable dates would be 04/17 and returns on 04/19.

ASSISTANT: As per your request, there is a flight with price 100 and the connections 1. Shall I proceed for booking?

USER: It is suitable for me to travel in that flight, please confirm my ticket.

ASSISTANT: Ok, your reservation is changed. The flight number is 1029.

USER: Ok, thank you for changing my existing ticket to my preferabale dates.

ASSISTANT: Thank you for reaching us.Have a great day.

USER: Thank you.