You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: I planned to meet my friend in LAX, can you please help me to book a flight ticket from IAD?

ASSISTANT: Sure, please share your travel dates.

USER: I prefer to travel on Oct 18 and Oct 20.

ASSISTANT: May I know your specifications?

USER: I would like to return back in evening.

ASSISTANT: Can you mention your name to proceed further?

USER: I am Carol Thompson.

ASSISTANT: Sorry, no flights found as per your requirement.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.