You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I am Kathleen Thomas want to change my reservation, can you  help me out with this please?

ASSISTANT: Sure, I am mirthful to help you with that.

USER: Thank you.

ASSISTANT: Please hold on for a while. Sorry, I didn't find any reservation on your name in our database.

USER: That's ok, thank you for the response.

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