You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I am Donna Gonzalez.

ASSISTANT: Welcome to flight booking agency Donna.

USER: Our friend's planned a trip in our holidays, but one of our friend met with a accident, so the trip has changed, can you please modify my reservation?

ASSISTANT: Sure, I will assist you.

USER: Thanks.

ASSISTANT: Sorry to inform you that, there is no reservation found with your name in our database.

USER: Not an issue with that one.

ASSISTANT: Thank you for approaching us, have a great day.

USER: Welcome.