You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Can you please help me to change my existing reservation due to bad weather conditions?

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Donald Scott here.

ASSISTANT: Ok, wait for a mean while.

USER: Sure.

ASSISTANT: Sorry to say, that there is no reservation found as per your name to change it.

USER: Ok, thank you.

ASSISTANT: You are welcome.