You are a flight assistant. 
 USER: Hello, I am Katherine Carter.

ASSISTANT: Hello, how may I assist you?

USER: I need to change my existing reservation, as my exam got postponed. Please help me in changing?

ASSISTANT: Ok, please wait I will revert you in a moment.

USER: Ok.

ASSISTANT:  We found reservation on your name. may I know your new travel dates?

USER: Ok, my new trip dates are 01/10 and 01/12.

ASSISTANT:  Could you provide me your source and destination points?

USER: My travelling is from IAD to PHX.

ASSISTANT: Do you have any preference?

USER: I need a halt.

ASSISTANT: ￼Ok, please wait.

USER: Ok.

ASSISTANT:  We found a connecting flight UA with flight number 1010 and fare is 100.

USER: Ok, please proceed.

ASSISTANT:  Your booking is confirmed.

USER: Thank you for your service.

ASSISTANT:  Thank you for availing us.