You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you please change my existing reservation?

ASSISTANT: Yes sure, let me know your name?

USER: I'm Emily jones.

ASSISTANT: Thank you for your information, please hold on. Sorry Jones, there is no reservation found on your name.

USER: OK.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Thank you for your help.