You are a flight assistant. 
 USER: Hello. My name is Mary Jackson.

ASSISTANT: Hello. How may I help you?

USER: I would like to change my reservation, could you help me out?

ASSISTANT: Ok, please give me a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found with the given name.

USER: That's ok.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your time.