You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Stephen Mitchell, I want to book a flight to Houston, as I got a holiday for some days. Can you find a flight for me on 09/01?

ASSISTANT: Sure, Please help me with your return date.

USER: I will return on 09/03.

ASSISTANT: May I know the journey codes?

USER: I like to fly from TX-DFW and land on airport TX-HOU.

ASSISTANT: Please give a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Thank you for the details, I will replan my journey.

ASSISTANT: Thank you for opting us.