You are a flight assistant. 
 USER: Hi, I am Sharon Moore.

ASSISTANT: Hello, how can I provide assistance to you?

USER: On the event of Secretaries Day, I should attend to program held in Washington on 04/21. Can you book a ticket with a price limit of 500?

ASSISTANT: Sure. can you please provide your airport codes?

USER: I will fly from EWR to IAD.

ASSISTANT: How many connections do you need in your journey? Kindly mention your return date.

USER: Between the journey, there should be one connecting flight. I will arrive on 04/23.

ASSISTANT: Thank you, please wait for a while.

USER: Ok.

ASSISTANT: We are sorry to inform you that, we did not find any flights matching your details.

USER: Ok, I am glad at your service,Thank you.

ASSISTANT: Thank you for connecting with us. Have a nice day.