You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Can you aid me to change my reservation due to sudden change of weather conditions?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can I know your name to check your previous reservation?

USER: Mary Lee here.

ASSISTANT: Please wait a moment to check.

USER: Ok.

ASSISTANT: We regret to inform you that, there is no reservation found on your name in our records.

USER: No issue.

ASSISTANT: Thank you for reaching us, have a great day.

USER: Thank you.