You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

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

ASSISTANT: Sure, please wait a moment, let me check with your details.

USER: Ok.

ASSISTANT: Sorry, there are no active reservations on your given name to change.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching our service.