You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I want to visit Dallas, can you please help me to book my flight ticket from HOU to DFW?

ASSISTANT: Could you please provide me your travel dates?

USER: Sure, I would like to depart on 03/24 and return back 03/26.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: There is a flight with Spirit airlines and the ticket figure is 900. Shall I proceed for this?

USER: Yes, you can proceed for booking the ticket.

ASSISTANT: For reserving the ticket. May I know your name please?

USER: My name is Elizabeth Evans. But please make sure that the ticket fare is less than 500.

ASSISTANT: Evans sorry to intimate, no flights are available with your requirements.

USER: Not an issue. Thank you for the information.

ASSISTANT: You are welcome.