You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I serve you?

USER: I want to change my existing reservation due to postpone of my document verification. Can you assist me with this?

ASSISTANT: Sure, may I know your name?

USER: Myself George Martin.

ASSISTANT: Please wait for a minute, I will revert to you with current status.

USER: Sure.

ASSISTANT: There is no reservation found with your name.

USER: Ok, thanks for your response.

ASSISTANT: Thank you for availing us.