You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I would like to change my reservation as I have to stay for some days with my grandfather at New York, can you please help me?

ASSISTANT: Ok, may I know your name?

USER: Sure, my name is Amanda White.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation found under your name.

USER: Oh! No problem, thank you for checking.

ASSISTANT: Most welcome.