You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me in changing my existing reservation?

ASSISTANT: Sure, may I know your name please?

USER: My name is Angela Baker.

ASSISTANT: Ok, please wait.

USER: Sure.

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

USER: Ok, not an issue.

ASSISTANT: Most welcome.

USER: Thank you for providing information.