Hello.
user
Hello.
assistant
I am John Clark.
user
How may I serve you at this moment?
assistant
 Due to sudden change in my planned dates of journey, I would like to change my reservation. Can you please help me out with changing of my reservation?
user
Sure, I am here to help you.
assistant
Thank you for accepting my request.
user
There is no existing reservation found on your name in our data base.
assistant
Ok, no problem with that one. Thank you for your help.
user
Thank you for reaching us.
assistant