You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Samantha Jones. Could you help me in booking a flight ticket from Dallas & Fort Worth to Houston on 05/21?

ASSISTANT: Sure, may I know your source and destination codes?

USER: My source and destination airport codes are TX - DFW, TX - HOU.

ASSISTANT: Please share me your return journey date.

USER: I want to return on 05/23.

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

USER: Yes, I need a halt.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.