Hello. I am Gregory Mitchell.
user
Hello, how can I help you?
assistant
Due to my health problem I want to change my reservation dates, can you please help me to change my travel dates?
user
Sure, please wait a minute.
assistant
Sure, I will wait for your positive response.
user
There is no reservation with your name. Thank you for reaching us.
assistant
Ok, my be I have reserved other airline service.
user