You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Thomas Wilson, help me to change my reservation. Can you please change it?

ASSISTANT: Sure, we will help you. Please give me a moment to check your details.

USER: Sure.

ASSISTANT: Thomas Wilson, there is no existing reservation on your name to proceed further.

USER: OK, thank you for informing me.

ASSISTANT: Thank you for contacting us.