You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I provide service to you?

USER: I am Lisa Johnson want to change my reservation due to prepone of my meeting. Can you help me in changing?

ASSISTANT: Sure, please wait for a second.

USER: Ok.

ASSISTANT: Thanks for being patience, there is no active reservation on your name.

USER: Ok, no issues. Thank you for your response.

ASSISTANT: Thank you for approaching us.