You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, please share your good  name?

USER: My name is Rebecca King.

ASSISTANT: Please stand by.

USER: Sure, take your time.

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

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

ASSISTANT: Thank you.