You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, let me know your name please.

USER: I am Kathleen Thompson.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no active reservation found with your name in our records.

USER: No issues, thank you for your information.

ASSISTANT: Most welcome.