You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you out?

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

ASSISTANT: Sure, I will check the reservation list and let you know.

USER: Ok.

ASSISTANT: May I have your name please?

USER: My name is Robert Brown.

ASSISTANT: Ok. Please wait.

USER: Sure.

ASSISTANT: Thanks for your time. But no reservation is found on your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your information.