You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Due to my health conditions, I want to change my recent reservation.Can you help me with that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name please.

USER: Richard Harris here.

ASSISTANT: Sorry, no reservation is found on your name in our database.

USER: No problem, Thanks for the information/.

ASSISTANT: Thank you for reaching us.