You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Angela Mitchell here.

ASSISTANT: How can I assist you today?

USER: I want to travel from IAD to LGA for attending a VLSI seminar. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I can assist you with that. Can you please mention your travel dates for booking flight ticket?

USER: My departure date is 02/21 and return date is 02/23.

ASSISTANT: Please hold on a moment, I will check flight availability in this route.

USER: Ok, I will wait.

ASSISTANT: Sorry for the inconvenience no flights available in this route as per your requested date.

USER: Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.