You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Charles Phillips, here.

ASSISTANT: How can I assist you?

USER: I want to change my existing reservation due to heavy snow fall in JFK.

ASSISTANT: Sure, wait for a minute.

USER: Ok.

ASSISTANT: Yes Charles, your reservation is found may I know your source and destination details?

USER: I am travelling from SEA to DCA.

ASSISTANT: Sure, may I know your travelling dates?

USER: Travel dates are 06/14 to 06/16.

ASSISTANT: Yes Charles, I found a flight-1004 with delta airlines, can I proceed?

USER: Please proceed for booking.

ASSISTANT: Yes, your ticket is confirmed.

USER: Thanks for your help.

ASSISTANT: Thank you for approaching us, have a safe journey.