You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: I am Virginia Young, I would like to travel from JFK to AUS to meet my grand parent's?

ASSISTANT: Sure, may I know your travel dates please?

USER: But I done wrong booking in that so can you help me for changing my existing reservation?

ASSISTANT: Sure, wait a minute please.

USER: OK.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it.

USER: Oh! It's ok, I think my brother already changed my reservation.

ASSISTANT: Ok, thank you.

USER: You are welcome.