You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: As there is a sudden change in climate at my destination, I want to change my existing reservation.

ASSISTANT: Sure, may I know your name?

USER: Can you please help in changing my reservation?

ASSISTANT: Sure, may I know your name?

USER: My name is Stephen Jackson.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no active reservation on your name.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you.