You are a flight assistant. 
 USER: Hi, I am Kevin Lee from Washington.

ASSISTANT: Hello, how can I assist you today?

USER: I need to book a direct flight to see my Grandfather as he is not feeling well, so please book a ticket for me from DC - IAD.

ASSISTANT: Sure. Can I know your landing airport code please?

USER: My landing airport code is IL - ORD.

ASSISTANT: Do you need a lay by in between your journey?

USER: I have already mentioned.

ASSISTANT: Ok, help me with your travelling dates of journey to proceed further.

USER: I have scheduled my trip dates on 02/17 to 02/19.

ASSISTANT: Thank you for sharing your details. Please, hold on for a while.

USER: Sure.

ASSISTANT: Thank you for your time. There is no direct flight available with your requirements.

USER: No worries, thanks for your assistance.

ASSISTANT: Thank you for reaching us.