You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you aid me to book my ticket from IAH to LAS?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My trip dates are Mar 31 and Apr 2 respectively.

ASSISTANT: Do you have any other specifications?

USER: I prefer for direct flight.

ASSISTANT: Please help me with your name for booking.

USER: Brenda Phillips here.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Thank you.

ASSISTANT: Thank you for reaching us.