You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I oblige you today?

USER: I would like to change my reservation due to heavy floods at my destination place, so aid me in changing.

ASSISTANT: Sure, we are here to aid you. Let me know the your name to check with the reservation.

USER: Sure, my name is Alexander Nelson.

ASSISTANT: Please, stay online.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found with your name  Alexander Nelson.

USER: No problem, thanks for your quick response.

ASSISTANT: Thank you for availing us.