You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you at this moment?

USER: Can you please aid me to change my existing reservation?

ASSISTANT: Sure, we are here to assist you. May I know your good name?

USER: Myself Rachel Jones.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no active reservation found on your name in the airline database.

USER: That's fine, thank you for checking.

ASSISTANT: Thank you for choosing us.