Hello.
user
Hello, how can I help you today?
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 that?
user
 Sure, I am here to help you with that. May I know your name please?
assistant
Thank you, my name is Sarah Thomas.
user
Ok, Please stay online, I will check the previous list and revert to you.
assistant
Sure, take your time.
user
Thanks for remaining so positive. We are sorry to say that, there is no active reservation found on your name.
assistant
Oh! I think the ticket was not booked due to server issue.
user
Thanks for reaching us.
assistant
Anyway, thank you for the information.
user