You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Due to the wrong reservation by selecting the wrong dates. I want to change my reservation which I have done. Can you please help me about it?

ASSISTANT: Sure, may I know on whose you reserved the ticket?

USER: Sure, it was done under my name Barbara Thompson.

ASSISTANT: There is no reservation found under your name in our records, Barbara.

USER: Ok, it might be cancelled by my manager. Anyway thank you for the information.

ASSISTANT: Thank you for choosing us.