You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How may I help you?

USER: I made a reservation earlier to go for a holiday trip with my friend's, but due to some financial problems the trip got cancelled. Can you please change my existing reservation?

ASSISTANT: Sure, I will help you out in changing your reservation.

USER: Ok.

ASSISTANT: Can I know your name please?

USER: I am Justin Anderson.

ASSISTANT: Sorry Justin, there are no reservation found on this name.

USER: Ok, thanks for helping me.

ASSISTANT: Thank you for choosing our services.