You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

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, we are here to help you.

USER: Thank you.

ASSISTANT: Please share me your name.

USER: I am Brenda Davis.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation found on your name in our database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.