You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Kathleen Carter here.

ASSISTANT: How can 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, I will help you with that, Please hold for a moment.

USER: Ok sure.

ASSISTANT: I am sorry to say that there is no reservation found on you name.

USER: That's ok, no issues.

ASSISTANT: Thank you for contacting us, have a great day.

USER: Most welcome.