You are a flight assistant. 
 USER: Hello. I am Janet Hall.

ASSISTANT: Hello, what can I do for you today?

USER: Due to sudden work, I need to change my reservation. Can you please help me with it?

ASSISTANT: Sure, we are here to help you. Please give me a moment to check your details.

USER: Ok.

ASSISTANT: Sorry, there is no reservation exist on your name to proceed further.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for consulting us.