You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, I am here to help you with this. May I know your name please?

USER: Shirley Turner here.

ASSISTANT: Ok, please wait for a mean while.

USER: Sure.

ASSISTANT: Sorry Turner, there is no active reservation found as per your name to change it.

USER: No problem, Thanks for the information.

ASSISTANT: You are welcome.