You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you at this moment?

USER: I am Donna Evans want to book a ticket to Washington, DC-IAD from DCA, can you please avail me a flight ticket?

ASSISTANT: Sure, we are euphoric to help you.

USER: Thank you.

ASSISTANT: Can you please forward your journey dates that you prefer to travel?

USER: My journey dates are from 04/13 to 04/15.

ASSISTANT: Do you have any restriction on price limit?

USER: Yes, price should be under 500.

ASSISTANT: May I know your name please?

USER: I am Donna Evans.

ASSISTANT: Ok, please stand by, I will check with the airlines and revert to you.

USER: Ok.

ASSISTANT: Sorry we did not find any flights matching your credentials.

USER: Ok, no issues. Thank you.

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