You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Steven Turner here. Can you please help me with altering my previous reservation?

ASSISTANT: Sure, wait a minute.

USER: Ok, I will be waiting.

ASSISTANT: Sorry, there was no reservation found on your name.

USER: Oh! That's very sad to know. Anyways, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.