You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me to change my reservation on the name of Anna Hall?

ASSISTANT: Sure, we are here to help you. Please give me a moment to check your details in our database.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to inform you that there is no reservation found on the name Anna Hall.

USER: No issues, thanks for your effort.

ASSISTANT: Thank you for reaching us.