You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I need to change my existing reservation as my exams got postponed, Can you please help me with that?

ASSISTANT: Sure, I will help you. Please help me with your name.

USER: Jessica white here.

ASSISTANT: Thank you. Please allow me a minute.

USER: Sure.

ASSISTANT: Jessica white, I am really sorry to inform you that there is no reservation details found on your name.

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

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