You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Kenneth Lee. I want to book a flight ticket to attend an cultural event from TX-HOU to DC-DCA. Can you help me?

ASSISTANT: Sure, we are willing to help you. Please let me know your preferable journey dates.

USER: 11/12 and 11/14 are my travelling dates.

ASSISTANT: Do you need any halt within your journey?

USER: I need a connecting flight with in 200.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no flight available on your dates. Thank you for reaching us.

USER: No issue. Thank you.