You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: George Gonzalez here.

ASSISTANT: How can I assist you?

USER: I want to change my existing reservation which I have done earlier, due to bad health condition. Can you please help me out with it?

ASSISTANT: I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Ok, sure.

ASSISTANT: Sorry, there is no active reservation found on your name to change.

USER: Ok, not a problem. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.