You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Ryan Nelson.

ASSISTANT: How may I assist you?

USER: My business meeting has been postponed. So, I would like to change my reservation. Can you please help me with that?

ASSISTANT: Sure, wait a moment. Thanks for your time, there is no reservation found with your name to change it.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Ok, thanks for contacting us.