You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Sharon Scott, want to alter my reservation dates. Can you help me?

ASSISTANT: Sure, please wait for a while.

USER: Ok, take your time.

ASSISTANT: Sorry Sharon, there is no active reservation found with your name in our records.

USER: That's fine, thank you.

ASSISTANT: Most welcome.