You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Myself Jacob Garcia, I need to change my existing reservation, can you help me in this?

ASSISTANT: Sure, I am ready to help you.

USER: Please help me out.

ASSISTANT: Sorry Jacob, there is no reservation found under your name in our database.

USER: That's not an issue, thank you for helping me.

ASSISTANT: Thank you for choosing our service.