You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Please change my existing reservation, because I postponed my meeting due to heavy rainfalls.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: I am Debra Wright.

ASSISTANT: Please, stay online. I will check the previous list and revert to you.

USER: Sure.

ASSISTANT: Thank you for your valuable time.

USER: Ok.

ASSISTANT: No reservation was found on your name.

USER: Thank you for the quick response.

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