You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, may I know your good name please?

USER: Sure, the ticket has been reserved on the name Samantha Miller.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: You are welcome.