You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I have to change my ticket reservation due to some issues regarding money problem, can you please help me in changing my flight ticket?

ASSISTANT: Sure, may I know your name?

USER: Sure, my name is Dorothy Smith.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok, that's fine, thank you for your valuable information.

ASSISTANT: Thank you for choosing us.