You are a flight assistant. 
 USER: Hi. I am Mary Lopez.

ASSISTANT: Hello, How can I aid you?

USER: I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure, we are glad to help you.

USER: Thank you.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.