You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Jacob Gonzalez.

ASSISTANT: How can I assist you today?

USER: I need to change my existing reservation, can you please help me out?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Sure, please take your time.

ASSISTANT: Jacob, there is no reservation found under your name.

USER: That's ok, thank you for searching details.

ASSISTANT: Thank you for reaching us.