You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, may I know your name to check your reservation status?

USER: Sure, my name is Helen Carter.

ASSISTANT: Thanks for your response, wait a moment I will revert you back with the proper information.

USER: Sure, take your time.

ASSISTANT: There is no flight reserved with your name to change it.

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

ASSISTANT: Thanks for consulting us.