You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jason Roberts.

ASSISTANT: Jason, how may I assist you today?

USER: I would like to change my reservation, due to heavy rainfall in New York, can you help me?

ASSISTANT: Sure, I can do that for you. Please wait for a moment.

USER: Sure.

ASSISTANT: I have checked for your reservation but I have not found any reservation by your name in our database.

USER: That's ok, thank you for your information.

ASSISTANT: You are welcome, thank you for choosing us.