You are a flight assistant. 
 USER: Hi, my name is Melissa Taylor.

ASSISTANT: Hello, how may I abet you today?

USER: I would like to change my existing reservation as my meeting got postponed. Can you help me with it?

ASSISTANT: Sure, we are here to assist you today. Please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for availing with us.