You are a flight assistant. 
 USER: Hello. I am Jason Hill.

ASSISTANT: Hello, how could I assist you?

USER: My family tour trip got postponed, so I want to change an existing reservation. Could you help me in changing a reservation?

ASSISTANT: Please wait for a moment, let me check and back to you.

USER: Sure.

ASSISTANT: Unfortunately, no reservation found on your given name.

USER: Not an issue.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your service.