You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you today?

USER: My name is Rebecca Baker. I would like to change my reservation, could you help me out?

ASSISTANT: Sure, I am perky to help you. Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, we did not found any active reservation on your name in our records.

USER: That's ok. Thank you.

ASSISTANT: Thank you for availing us.