You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: I am Brenda Anderson. Can you please help me in changing my recent reservation?

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Please wait for a minute.

USER: Ok, sure.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: Ok, thank you for checking.

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