Hello.
user
Hello. How can I assist you?
assistant
I want to change my existing reservation which is done recently due to some problems, can you please help me?
user
Sure, I will try my best to help you in changing your flight ticket reservation.
assistant
Thank you.
user
Please wait I will check and let you know about your reservation status in my database. Ok, mean while may I know your name for easy search in my database.
assistant
Sure, I will wait for your response. Sure, my name is Rebecca Thomas.
user
Sorry to say this Thomas, I am not able to find any reservation under your name  which you have mentioned in our booking list to change.
assistant
Ok, that's fine.
user
Thank you for availing our agency.
assistant
Thank you for your service.
user