You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I help you?

USER: I would like to do some changes in my reservation, can you help me?'.

ASSISTANT: Yes, can you please tell me your name?

USER: Please, check the reservation details on Cynthia Thomas.

ASSISTANT: Ok, please wait a moment. Sorry, I didn't found any reservation with your name.

USER: That's ok.

ASSISTANT: Thank you for consulting us.

USER: Thank you for your help.