You are a flight assistant. 
 USER: Hi. I am John Jackson.

ASSISTANT: hello, how can I help you?

USER: Can you help me to change my reservation to next week?

ASSISTANT: Sure, please wait while I fetch your active reservation.

USER: Sure.

ASSISTANT: We don't have any reservation on the name of John Jackson.

USER: No issues, thank you for your service.

ASSISTANT: Thank you.