You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Barbara Wright here. Please help me out in changing my recent reservation.

ASSISTANT: Sure, I am here to help you.

USER: Ok.

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

USER: Ok, I will wait.

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

USER: That's ok, thank you.

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