You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I am planning to change my reservation, help me in that?

ASSISTANT: Sure, I am here to help you out with that. For that I need to know your name. Can you please provide me?

USER: I am Catherine Brown.

ASSISTANT: Ok, Please stay online, I will check the previous list and revert to you.

USER: Ok.

ASSISTANT: Thanks for remaining so positive, we are sorry to say that there is no active reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thanks for choosing us, have a good day.