You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I need to change my recent reservation, can you help me in doing that?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: I am Dennis Harris.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Dennis Harris, there is no active reservation found under your name to do modifications in that.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for choosing us, have a nice day.