You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Jessica Clark. I need to change my previous reservation due to some issues in my office. Could you please help me in doing that?

ASSISTANT: Sure, please wait a while.

USER: Ok.

ASSISTANT: Thank you for being patient. Unfortunately, we didn't found any reservation matching your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for consulting us.