You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what kind of service you are expecting from our side?

USER: I am Timothy King. I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure, I am here to assist you.

USER: Thank you.

ASSISTANT: Just give me a minute please.

USER: Sure.

ASSISTANT: Sorry to inform that there is no active reservation found on your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for consulting us, have a happy day.