You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Yes, can you tell me your name?

USER: Sure, my name is Kevin Smith.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.