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