You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I want to book a flight ticket from Washington IAD to New York LGA. Can you make a reservation for me?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT: To make a reservation, can you please share me your travelling dates?

USER: Ok, my planned journey dates are on Sept 22 and return on Sept 24.

ASSISTANT: Is there any other specifications, please let me know?

USER: Yes, I want an economy class.

ASSISTANT: May I know your name please for documentation purpose?

USER: Yes, I am Jerry Anderson.

ASSISTANT: We are sorry to inform you that there is no flight found with your matching details.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you.