You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you aid me in booking a flight ticket from IAH to DFW?

ASSISTANT: Sure, I am here to help you for this. Could you please share me your credentials?

USER: I would like to go on June 13th and return back on June 15th.

ASSISTANT: Do you have any criteria, regarding your journey?

USER: Ensure it is a direct flight.

ASSISTANT: Is there any other specifications?

USER: No, I don't have any specifications.

ASSISTANT: For proceeding further. May I know your name please?

USER: Myself Robert Adams.

ASSISTANT: Sorry to inform, no flights are found with your criteria.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you very much for approaching our agency.