You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for the day?

USER: I would like to change my reservation due to some issues, can you please help me to change?

ASSISTANT: Sure, we will help you.

USER: Thank you.

ASSISTANT: Can you please share your name to check the reservation?

USER: Sure, you can check the reservation on the name of Anna Hill.

ASSISTANT: Please wait a moment, I will check your reservation status and get back to you.

USER: Sure.

ASSISTANT: We are sorry to inform you that there is no reservation found on your name to change.

USER: Not an issue, thank you.

ASSISTANT: Thank you for contacting us.