You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you help me in changing my recent reservation?

ASSISTANT: Yes, I am gleeful to help you with that. Could you please mention your name? So that, It is easy for me to check the status.

USER: I am Janet Evans.

ASSISTANT: Ok, please give me a minute. I will tell you the information about the ticket status.

USER: Sure.

ASSISTANT: I am really sorry to inform you that, there is no previous reservation with your name in our database to change the details.

USER: Its ok, thank you.

ASSISTANT: You are welcome. Thank you for opting us.