You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello,. How can I be at your service?

USER: Please book a ticket from Phoenix, AZ-PHX to Washington DC-DCA.

ASSISTANT: Sure, how much you can afford for a flight ticket?

USER: Price limit 200.

ASSISTANT: Please share me your journey dates?

USER: Departure is on 02/12 and will return by 02/14.

ASSISTANT: Let me know your name?

USER: My name is Emma Turner.

ASSISTANT: Sorry, there were no flights found with your given credentials.

USER: Thanks.

ASSISTANT: Thank you.