You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donald Anderson.

ASSISTANT: How can I help you?

USER: I have to modify my flight ticket booking done in the last month to visit Seattle but the destination location has changed to Boston, can you please help me in flight ticket changing?

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

USER: Ok, no problem with that one. Thank you for your immediate help in providing the information.

ASSISTANT: Thank you for opting us.

USER: Welcome.