You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: George Robinson here.

ASSISTANT: How can I  help you?

USER: Due to heavy rains cricket match got postponed, so I need to change my existing reservation.

ASSISTANT: Sure. just a moment  please.

USER: Ok.

ASSISTANT: I am sorry no reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.