You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation which is with the name Carolyn Smith. Please help me out.

ASSISTANT: Sure, we are hereto help you. Please wait a while let me check the reservation status and let you know the information.

USER: Ok.

ASSISTANT: Sorry, I found no reservation in your given name.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.