You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I have done reservation last week but I would like to change it right now. Can you help me out of it?

ASSISTANT: Sure, may I know your name please to change your reservation?

USER: I am Michelle Thomas.

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

USER: Ok, thank you for the information.

ASSISTANT: Thank you, for contacting us.