You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, I am happy to help you. Please let me know your  good name.

USER: I am Jonathan Jackson.

ASSISTANT: Sorry, we did not find any active reservation on your name in our records.

USER: No issues, thank you for checking.

ASSISTANT: Thank you for contacting us.