You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Christine Perez, I need to book a flight ticket on 03/03, so I need your help.

ASSISTANT: Ok, please forward your airport codes?

USER: My locations are TX - HOU to DC - IAD.

ASSISTANT: When will you return?

USER: My return date is 03/05.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a flight with a halt.

ASSISTANT: Thanks for providing your details, no flights are available with your given details.

USER: No problem, thanks for your kind service.

ASSISTANT: Thanks for opting us.