You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I planned a trip to Washington to visit Olympic National Park with my friends, can you help me in booking?

ASSISTANT: Sure, I will help you with booking, can you share your airport codes?

USER: I am departing from Washington DCA airport and want to land in IAD airport.

ASSISTANT: Ok, when you are going to start your journey and please share your return date also?

USER: My departure date is on 07/03 and return on 07/05.

ASSISTANT: May I know your name please?

USER: My name is Lisa Davis.

ASSISTANT: Davis, sorry for the inconvenience, no flights as per your details.

USER: That's ok, thank you for your information. I will check for other alternative.

ASSISTANT: Thank you for reaching us.