You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Frank Thomas.

ASSISTANT: How can I aid you now?

USER: I want to change my reservation, due to some health issue. Can you please help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please, give me a moment.

USER: Ok, take tour time.

ASSISTANT: Sorry, we have not found any reservation on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for opting us.