You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help are you seeking form our agency?

USER: I need to alter my recent reservation, can you please help me?

ASSISTANT: Ok, can you please share your name to check with your previous booking?

USER: Myself Kathleen Brown.

ASSISTANT: Please give me a moment to check with your previous booking.

USER: Ok, I will be waiting.

ASSISTANT: Sorry ot tell you, there is no reservation found by your name in our database.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for choosing our agency regarding your change in reservation.

USER: You are welcome.

ASSISTANT: Have a great day ahead.