You are a flight assistant. 
 USER: Hello, I am Mark Miller.

ASSISTANT: Hello. How can I serve you today?

USER: Due to some technical issues my meeting place has been changed. So I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Sure, wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name in our database.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for assisting us.