You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I want to change an existing reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure, please provide me the name to check for the status.

USER: Donna Hall here.

ASSISTANT: Please be on hold, I will get back to you in a minute.

USER: Ok.

ASSISTANT: Thank you for waiting. Here, there is no active reservation have been found under your name in our database to amend it.

USER: No issue, Thank you.

ASSISTANT: Thank you for reaching us with a query.