You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my existing reservation. Can you help me in that?

ASSISTANT: Sure, we are here to help you. May I know your good name please?

USER: Myself Angela Thomas.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no active reservation found in your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.