You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you today?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, can you share your good name please?

USER: Janet Thomas here.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Ok, thank you.

ASSISTANT: Thank you for contacting us.