You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I need to change my latest reservation, can you please help me?

ASSISTANT: Sure, may I know your name?

USER: Myself Rebecca Williams.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

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

USER: That's ok, thank you for searching my details.

ASSISTANT: Most welcome.