You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What kind of help are you looking for?

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

ASSISTANT: Sure, we will help with that.

USER: Thank you.

ASSISTANT: Please share your good name?

USER: My name is Charles Robinson.

ASSISTANT: Please hold a moment, while I check the status of the reservation.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, there is no reservation found with the given name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you.