You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I need to travel in the middle of the month instead of  end of the month, hence I need your help to alter my recent reservation.

ASSISTANT: Sure, I am here to help you with this.

USER: Can you please help me with that?

ASSISTANT: Ok. May I know your name please?

USER: Michelle Green here.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry Green, there is no reservation found as per your name to alter your reservation in your database.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome.