You are a flight assistant. 
 USER: Hi. I am Brenda Allen.

ASSISTANT: Hello. How can I aid you?

USER: I would you like to change my recent reservation, can you help me over that?

ASSISTANT: Sure, We are here to help you.

USER: Thanks.

ASSISTANT: Give me a minute.

USER: Sure, take your time.

ASSISTANT: Thanks for your time. We didn't found any reservation by  this name.

USER: It's ok, thanks for checking.

ASSISTANT: Thanks for choosing us.