You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I need to change my existing reservation on the name of Laura Smith.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for your patience, There is no reservation found on your specified name.

USER: No problem. Thanks for your information.

ASSISTANT: Thank you for approaching us.