You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Dorothy Anderson.

ASSISTANT: How can I help you?

USER: I was planned that to change in my existing reservation, because I want to spend some more days in my destination place. Can you help me with that?

ASSISTANT: Sure, I will help you in change your reservation.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found with your name to change the reservation.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.