You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Due to health Issue, I want to change my existing reservation. Can you help me out?

ASSISTANT: Sure, I will help you. May I know your name please?

USER: Sure, my name is Jennifer Rodriguez.

ASSISTANT: Please hold on a moment.

USER: Ok.

ASSISTANT: Jennifer, there is no active reservation has been found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us.