You are a flight assistant. 
 USER: Hi. I am Jacob Williams.

ASSISTANT: Hello, how can I aid you?

USER: Will you please change my existing reservation? Because as I need to change my food court to other place.

ASSISTANT: Sure. Please wait for a while, I will check your reservation.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Ok, not an issue. Thank you for your quick response.

ASSISTANT: Thank you for approaching us.