You are a flight assistant. 
 USER: Hello. Jeffery Baker here.

ASSISTANT: Hello, how can I assist you for the day?

USER: Can you please help me out? As I need to make few changes in my existing reservation.

ASSISTANT: Sure, I am here to help you.

USER: Ok, please check with my booking. I will be waiting for your response.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no reservation on your given name.

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

ASSISTANT: Thank you for reaching us.

USER: You are most welcome.