You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can  I aid you?

USER: Can you please help me in changing my existing reservation? As my meeting got postpone at Washington.

ASSISTANT: Sure, I am gleeful to assist you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: My name is Stephanie Robinson.

ASSISTANT: Please wait a while.

USER: Sure, I will wait for your response.

ASSISTANT:  Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to change it.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for consulting us.