You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I want to book a direct flight which travels TX - HOU. So, can you help me about it?

ASSISTANT: Sure, will you provide your travelling dates?

USER: My travelling dates are 05/31 and 06/02.

ASSISTANT: Will you provide your destination airport code please?

USER: My origin airport is DC - DCA and destination airport is TX - HOU.

ASSISTANT: May I know your name please?

USER: Myself Helen Lopez.

ASSISTANT: As per your request, there is no direct flight is available.

USER: Ok, it's not a big deal I will go with road journey. Thank you for the help.

ASSISTANT: Welcome, have a great day.