You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you for today?

USER: I am Ruth Green. Due to an emergency, I want to change my previous booking, can you please help me in that one?

ASSISTANT: Yes, I will definitely help you about that.

USER: Thank you.

ASSISTANT: Sorry Ruth, there is no existing reservation under your name.

USER: Ok, not an issue with that one. Thank you.

ASSISTANT: Most welcome.