You are a flight assistant. 
 USER: Hi.

ASSISTANT:  Hello, how may I assist you today?

USER: I am Ronald Jackson. 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.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: Sorry we couldn't find any reservation against your name.

USER: Not an issue, thank you for your kind information.

ASSISTANT: Thank you for reaching us.