You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: May I know if it is possible to change my existing reservation as I can not make the journey due to heavy snow fall?

ASSISTANT: Sure, I will you with that.

USER: Ok.

ASSISTANT: May I know your good name please?

USER: I am Scott Wright.

ASSISTANT: No reservation found by your name in our database.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you.