You are a flight assistant. 
 USER: Hi, I am Donna Jones.

ASSISTANT: Hello, do you want any help from us?

USER: I am planning to surprise my friend who stays at Dallas on the occasion of his birthday, can you please avail me a flight ticket?

ASSISTANT: Sure, I will avail you. Could you share your journey dates?

USER: My journey dates are from 03/19 to 03/21.

ASSISTANT: Ok, provide your source and destination points.

USER: My source and destination airport codes are Washington, DC-DCA and Dallas, TX-DFW.

ASSISTANT: May I know your price limit and connection limit?

USER: Price limit is 1000 for my ticket. Connection limit is one.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Sorry, there are no flights available currently from your source.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for approaching us.