You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I serve you?

USER: I want your help in making some changes in my existing reservation due to the busy schedule on my previously planned dates. Please change my reservation on the name of Rachel White.

ASSISTANT: Sure, wait for a minute.

USER: Sure.

ASSISTANT: There is no reservation found in your name. Thanks for choosing us.

USER: No problem, thanks for your support.