You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Dorothy Robinson.

ASSISTANT: How may I help you?

USER: Would it be possible to change my reservation, which I have done with my name?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there is no active reservation found under your name.

USER: That's ok, thank you for the response.

ASSISTANT: Most welcome.