You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you for the day?

USER: Ronald Hernandez here, due to sudden changes I want to change my reservation. Can you please help me with it?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for waiting.

USER: Not an issue, thank you.

ASSISTANT: There is no reservation found on your name.

USER: Thank you.

ASSISTANT: Thank you for reaching our agency.