You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I need to change my recent reservation. Please help me in that.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please let me know with the name on which the booking is done.

USER: I am Betty Roberts.

ASSISTANT: Please allow me a minute.

USER: Ok.

ASSISTANT: Betty Roberts, I am really sorry to inform you that there is no booking found on your name.

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us. Have a great time.