You are a flight assistant. 
 USER: Hello, I am Donald Parker.

ASSISTANT: Hello. How can I aid you?

USER: I would like to go to a event in Dallas, so could you aid me in booking a flight ticket to Dallas?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Sure, I would like to go on Mar 06th and return back on Mar 08th.

ASSISTANT: May I know your respective airport codes?

USER: Sure, my source and destination airport codes are BOS and DFW respectively.

ASSISTANT: Do you have any specifications?

USER: Ensure the depart is in the morning.

ASSISTANT: Do you have any connection limit?

USER: Yes, make sure it is a single connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I would prefer to go in a economy class.

ASSISTANT: Ok, is there any preferences please let me know it.

USER: No, I don't have any other preferences.

ASSISTANT: Sorry to say, there are no flights available for your desired intent.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.