You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, May I know your good name?

USER: I want to change the reservation which is with the name of Michelle Thomas. Can you help me with this?

ASSISTANT: Sure. Please wait a moment I will check and let you know the information.

USER: Ok.

ASSISTANT: We found that no reservation available with your name.

USER: Thank you.

ASSISTANT: Thank you for contacting us.