You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I am Stephanie Carter. Due to emergency meeting , I want to change my existing reservation. Can you please help me out?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: Ok, it's not a problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.