You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for today?

USER: Can you please help me in changing  my existing reservation to New York? As my meeting got postponed at New York.

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can you please provide your name to check the reservation status?

USER: My name is Mary Martin.

ASSISTANT: Sorry to say this Mary Martin, there is no active reservation with your name in our booking list.

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

ASSISTANT: You are welcome, thank you for reaching us. Hope you have a nice day ahead.