You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you help me in doing a reservation from HOU to DFW?

ASSISTANT: Sure, I will help you. Please help me with your planned travelling dates.

USER: My trip dates are Feb 21 to 23.

ASSISTANT: Please help me with your name.

USER: Emily Robinson here.

ASSISTANT: Do you need a break in between your journey?

USER: I need a direct flight.

ASSISTANT: Do you have any other preferences in your journey?

USER: Please ensure that my return time is in evening.

ASSISTANT: Please allow me a minute.

USER: Sure, take your time.

ASSISTANT: Emily Robinson, I am really sorry to inform you that there are no flights available for your journey.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for understanding. Thank you for reaching us. Have a great time.