You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please assist me to book me a flight from IAD to ORD to meet my family?

ASSISTANT: Sure, I will help you. Please help me with your planned travelling dates.

USER: I have planned to travel on Apr 05th and return on Apr 07th.

ASSISTANT: Please help me with your name.

USER: Jack Lee.

ASSISTANT: Do you need a break in between your journey?

USER: I like one connecting flight.

ASSISTANT: Do you have any other preferences in your journey?

USER: I want to return at morning time.

ASSISTANT: Please allow me a minute.

USER: Ok.

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

USER: Ok, no problem.

ASSISTANT: Thank you for understanding.

USER: Thank you.

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