You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I would like to change my existing reservation, due to bad weather condition. Can you please help me?

ASSISTANT: Sure, can you please mention your name?

USER: My name is Catherine Mitchell.

ASSISTANT: Sorry, no reservation found with your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us.