You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi. How may help you?

USER: Myself Carolyn Clark. I have a event in Washington, can you book a ticket for me?

ASSISTANT: Sure, please provide me your details?

USER: My location codes are from EWR to IAD, and preferable date are from 05/21 till 05/23.

ASSISTANT: No flight available on your details.

USER: It's ok.

ASSISTANT: Thank you.

USER: Thank you for your information.