You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation due to heavy rainfall, can you please help me with that?

ASSISTANT: May I know your good name please? Sure, I will help you to change your reservation.

USER: My name is Jason Martinez.

ASSISTANT: No reservation has been found on our database.

USER: Not an issue, thank you.

ASSISTANT: Sorry for Inconvenience, thank you for choosing us.