You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Sarah Rodriguez. I want to change my reservation due to sudden heath issue, can you help me?

ASSISTANT: Sure, I will help you to change your reservation. Please wait for a moment, while I check for the reservation on your name.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us, we hope see you again.