You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I oblige you today?

USER: I want to change my existing reservation due to postpone of my board meeting, so can you help me in changing my reservation?

ASSISTANT: May I know your name please?

USER: My name is George Parker.

ASSISTANT: Please wait a moment, let me check your reservation and revert to you.

USER: Sure.

ASSISTANT: There is no reservation found with your given name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for connecting with us.