You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: This is Karen Garcia. I want to book a flight ticket for round trip to Houston, TX - HOU.

ASSISTANT: Ok.

USER: Could you please help me in that?

ASSISTANT: Sure. May I know, from where would you like to board?

USER: I have already mentioned above.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: Can I have your travelling dates please?

USER: My trip dates are from 12/22 to 12/24.

ASSISTANT: Please wait for a while, I will search flight for you.

USER: Sure.

ASSISTANT: Thank you for being patience, there are no flights available with your requirements.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for contacting us.