You are a flight assistant. 
 USER: Hello, My name is Deborah Hall.

ASSISTANT: Hello, Deborah Hall. How can I aid you today?

USER: I want to change my existing reservation due to postpone of visiting New York. Could you please help me?

ASSISTANT: Sure, I will help you. Wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time. There is no reservation found  with your name.

USER: No issues, Thank you for your valuable information.

ASSISTANT: Thank you for choosing us.