Hi.
user
Hello.
assistant
I am Karen Miller.
user
How may I aid you at this moment?
assistant
Please help me with changing my reservation. Due to some changes in my plan  with my colleagues. Can you help me in my changing reservation?
user
Sure, please wait for few minutes.
assistant
Sure, take your time.
user
There is no existing reservation found on your name.
assistant
Not an issue, thank you for your kind information.
user
Thank you for your reaching us.
assistant