You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need to change my existing reservation because of some financial problem. Can you change my reservation?

ASSISTANT: Ok, please hold on for a while, I will check the possibility. Can I know your name?

USER: Ok, myself Kathleen Campbell.

ASSISTANT: There is no ticket showing on our database under your name.

USER: That's ok,  no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for checking your data base.

ASSISTANT: Welcome.