You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Catherine Green, can you help me to change my reservation which I had recently did?

ASSISTANT: Sure, please wait a moment I will check your details and proceed further.

USER: Ok, take your time.

ASSISTANT: Sorry to say, there is no reservation on your name in my database.

USER: That's ok, thank you for assisting me.

ASSISTANT: Thank you for choosing us, have a nice day.