You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: Thank you for considering my request. Myself John Scott.

ASSISTANT: Ok, please wait for some time while I'll check your reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: John Scott, there is no active reservation found under your name to do changes in that.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thank you for choosing us.