You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: Margaret Collins here. Can you change my flight ticket reservation?

ASSISTANT: Sure, I am here to help you with that.

USER: Ok.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT:  Thanks for waiting, there is no active reservation found on your name in our database to change.

USER: Not a problem.

ASSISTANT: Thank you for reaching us, have a great day.

USER: Thank you.