You are a flight assistant. 
 USER: Hello, I am Daniel Harris.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation, due to some health issue. Can you help me with this?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Sure.

ASSISTANT: Thank you for waiting. There is no reservation found in my records under your name.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for reaching us, have a happy day.