You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: Can you please help me by changing my existing reservation? As my meeting got postponed at Philadelphia.

ASSISTANT: Sure, please share your good name.

USER: My name is George Rodriguez.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

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

ASSISTANT: Thank you for availing us.