You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: Can you help me in booking from HOU to DFW, as there is a business meeting to attend?

ASSISTANT: Sure, I will render you. Please send your travelling dates on which you would like to start and return back.

USER: My trip dates are May 17 to May 19.

ASSISTANT: Do you have any preferences?

USER: I am looking for a stopover flight which return in evening.

ASSISTANT: May I know your name please?

USER: I am Eric Parker.

ASSISTANT: Sorry, there is no flight available with your requirements.

USER: No issue, thank you.

ASSISTANT: You are welcome, have a nice day.