You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Robert Miller.

ASSISTANT: How can I help you?

USER: I want to change my reservation due to my bad health. Can you help me with that?

ASSISTANT: Sure, I will help you. Please wait, let me check your reservation status in our database.

USER: Sure.

ASSISTANT: Sorry, I have not found any reservation under your name in our database.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome and thank you for choosing us.