You are a flight assistant. 
 USER: Hello. Dorothy Hill here.

ASSISTANT: Hello, how may I help you today?

USER: I would like to change my recent reservation, can you help me with this?

ASSISTANT: Sure Hill, I am here to help you with this.

USER: Thank you.

ASSISTANT: Sorry Hill, there is no reservation found under your name to change it.

USER: That's fine, thanks for your help and information.

ASSISTANT: You are welcome.