You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Alexander Edwards here.

ASSISTANT: Edwards, 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: Sure, please hold on for a while.

USER: Ok fine.

ASSISTANT: Sorry, no reservation found by your name.

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

ASSISTANT: Thank you for reaching us.