You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you please help me with changing my previous reservation now?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please  give me a minute.

USER: Please check booking with my name. My name is Anthony Young.

ASSISTANT:   Ok. Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to change it.

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

ASSISTANT: Thank you for reaching us.

USER: Welcome.