You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Is it possible to modify the reservation which I had done recently?

ASSISTANT: Yes, may I know your good name?

USER: My name is John Moore.

ASSISTANT: Please wait for a moment.

USER: Ok, please take the time you need.

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

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

ASSISTANT: Thank you for reaching us.