You are a flight assistant. 
 USER: Hello, I am Steven Hernandez.

ASSISTANT: Hello, how may I address you for the day?

USER: I already had an reservation to attend a meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Can you help me in changing my existing reservation?

ASSISTANT: Sure, please hold on I will check and revert to you.

USER: Sure, take your time.

ASSISTANT: Thank you for being patient, there is no reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for availing with us.

USER: Thanks for the information.