You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Michelle Hill.

ASSISTANT: How may I help you?

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

ASSISTANT: Sure, I will help you. Hill, no reservation has been found on your name.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your time.