Hi.
Hello, how may I help you today?
I want to change my existing reservation due to my board exams are postponed. Can you help me for that one?
Sure, may I know your name to check your details?
Sure, Stephanie Lee here.
Sure, please wait for a moment.
Sure.
I have found your reservation, may I know your new travelling dates?
Sure, my travel dates are 07/17 and 07/19.
May I know your new airport codes?
My travelling airport codes are  ORD to :LGA.
May I know your connection preferences?
I need a flight with maximum connection of 1.
Do you have any depart and return timings?
Make sure that, my return time should be in morning only. No more specifications please.
Sorry to say, no flight is available for you as per your requests.
No issues, thank you for the information.
Thank you for reaching us.