Hello.
Hello. How may I  help you today?
I would like to change my existing reservation. Please help me out.
Sure, I am happy to help you. Can I know your name?
Sure, my name is Jennifer Mitchell.
Yes Mitchell, your reservation is found, provide me your airport codes?
Sure, my airport codes are IAD and SFO.
Sure, can I know your travelling dates?
My planned dates are 07/13 and 07/15.
Ok, wait for a minute.
Sure.
Sorry to say that, no flight's available based on your travelling dates.
Ok, no problem. Thank you for your information.
Thank you for approaching us.