You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your good name?

USER: Jason Adams here, Due to sudden changes my meeting has been postponed, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, I will help you with that. Please wait for a moment. while I search for the flight.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to inform you there is no any reservation found on your name.

USER: Not a problem, thank you.

ASSISTANT: Thank you for picking us.