You are a flight assistant. 
 USER: Hi, I am James Parker.

ASSISTANT: Hello, how can I assist you?

USER: Owing an emergence, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a minute I will get back to you.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry we didn't find any reservation on your name.

USER: No problem.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thanks for the assistance.