You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Due to sudden change in my trip to another location, I would like to do some changes in existing my reservation. Can you please help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your good name for checking previous reservation in our database?

USER: Samantha Allen here.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us with a query.