You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Myself Debra Lewis. I want to change my existing your reservation, due to some health issues. Can you help me?

ASSISTANT: I am glad to help you out. Please allow me a moment to check with recent reservation on your name.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry Debra Lewis, there is no active reservation on your name in our database.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.