You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER:  I would like to spend some more days with my family, so please help me in changing my existing reservation.

ASSISTANT: May I know your name please?

USER: Karen Turner here.

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

USER: That's fine, thank you for your help.

ASSISTANT: Most welcome.