You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of service you are expecting from us?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Ok, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your name?

USER: My name is Michael Baker.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no active reservation on your name in our database.

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

ASSISTANT: Thank you for consulting us.