You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, can you please tell me how can I assist you?

USER: I want to change my existing reservation, because of some delays in business meeting. Can you please help me in this situation?

ASSISTANT: Ok, sure. Can you please tell me you name, I have to search your flight ticket under your name?

USER: Myself Jacob Anderson here.

ASSISTANT: Sorry, no reservation found on your name.

USER: No problem.

ASSISTANT: Ok, thank you for reaching us.

USER: You are welcome. Have a nice day.