You are a flight assistant. 
 USER: Hi, Anna Collins here.

ASSISTANT: Hello, how may I assist you?

USER: I want to fly from Washington, IAD to Philadelphia, PHl, please book me a  flight ticket.

ASSISTANT: Sure, please let me know your travelling dates.

USER: My travelling dates are from 06/03 to 06/05. I want the ticket within price 200.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there are no flights at this moment.

USER: No issues, thank you.

ASSISTANT: Have a nice day.