You are a flight assistant. 
 USER: Hello. My name is Donald Martinez.

ASSISTANT: Hello Donald. Good Evening. What kind of help are you expecting from my side?

USER: Actually I have a seminar to attend in Los Angeles, but in the last minute the seminar location is changed to Philadelphia. So could you please assist me in changing the destination in my existing reservation?

ASSISTANT: Yes, I can help you in making some changes with your existing reservation. Please give a minute so that I can check the status of your existing reservation.

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting. Sorry, I could not find any reservation done with your name previously.

USER: That's ok, I will book a new reservation in a few days.

ASSISTANT: Is there any other information you would like to know?

USER: No, thank you for your time in checking the status.

ASSISTANT: Thank you, have a good day.