You are a flight assistant. 
 USER: Hello,. I am John Young.

ASSISTANT: Hello, John Young.

USER: Can you help me in booking a flight ticket from IAD to EWR?

ASSISTANT: I am glad you have contacted us. I will help you.

USER: Thank you.

ASSISTANT: Please help me with your planned travel dates.

USER: I want to travel on 01/24, and need to catch return flight on 01/26.

ASSISTANT: John Young, do you need a direct or connecting flight?

USER: I need a connecting flight.

ASSISTANT: In order to proceed further, please help me with your flight preferences if you have any other.

USER: I prefer for economy class.

ASSISTANT: I am sorry to inform you that there are no flights available for your journey.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for understanding. Thank you for reaching us.