You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you aid me to change the reservation which I had did recently.

ASSISTANT: Sure, we are here to help you. May I know your name?

USER: Ok, please check for the name Dorothy Hall.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: That is ok, thank you for assisting me.

ASSISTANT: Thanks for reaching us.