You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you today?

USER: Can you please change my reservation?

ASSISTANT: Sure, I am here to help you to change the details. May I know your name?

USER: I am Angela Parker.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: I regret to inform you that, I didn't found any reservation under your name to change the details.

USER: That's ok, thank you for your information.

ASSISTANT: Most welcome. Thank you for approaching us.