You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Will you help me to change my recent reservation?

ASSISTANT: Sure, may I know your name please?

USER: Susan Wilson here.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

USER: That's ok, thank you for checking.

ASSISTANT: Most welcome.