You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Carol Carter. I want to change my existing reservation, can you please help me with this?

ASSISTANT: Sure, wait a minute.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found on your name.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Thank you for reaching us.