You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I'm Frank Thompson. I would like to change my reservation due to personal health issue, could you please help me with that?

ASSISTANT: Sure, I can help you with that. Please allow me a moment to check for the previous reservation.

USER: Sure.

ASSISTANT: Your patience is greatly appreciated. Frank, there is no reservation found under your name.

USER: That's ok, no issues. Anyways, thank you for the information.

ASSISTANT: You are welcome. Thank you for contacting us.

USER: You are welcome.