You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ryan Lopez.

ASSISTANT: How can I help you?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: Sure, let me check your reservation status in our database.

USER: Sure.

ASSISTANT: Sorry, we couldn't found any reservation by your name in our database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.