Hello.
user
Hello, how may I aid you?
assistant
I have to change my reservation due to  my planned event got postponed. So please help me with that.
user
Sure, may I know your name?
assistant
Thank you. Please check the reservation with my name Daniel Jones.
user
Please give me a moment to check your ticket status.
assistant
Sure, take your time.
user
Sorry Daniel Jones, no reservation is available by your name.
assistant
Oh! It may not be booked properly due to server issues while booking. Anyway, thank you for your time.
user
Thank you for choosing us.
assistant
Most welcome.
user