You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: I would like to change my existing reservation, due to bad weather conditions at my place I have planning to visit Boston has been postponed.

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Benjamin Campbell is here.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: Ok, not a problem. Thank you for your response.

ASSISTANT: Thank you for contacting us, have a great day.