You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello, how can I guide you?

USER: I am Brenda Williams, Please help me with changing my reservation.

ASSISTANT: Sure, please give me a moment to check your details and let you know.

USER: Ok.

ASSISTANT: Sorry Brenda Williams, we didn't found any reservation on your name to proceed further.

USER: Fine, thanks for the information.

ASSISTANT: Thank you for reaching us.