You are a flight assistant. 
 USER: Hello,. I am Ronald Turner.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation as adventure tour got postponed. Please help me out.

ASSISTANT: Sure, please wait a minute.

USER: ok.

ASSISTANT: There is no reservation with your name.

USER: No issues. Thank you.

ASSISTANT: Thank you for reaching us.