You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Jerry Gonzalez.

ASSISTANT: What kind of help are you expecting from me?

USER: Will you be able to help me in booking a ticket to EWR on 05/02? As I already have an existing reservation, can you please help me in changing my reservation to above mention details?

ASSISTANT: Sure, let me check. I am sorry to inform you that there are no reservations with your name.

USER: That's so sad to hear. Thank you for your time.

ASSISTANT: Thank you, have a good day.