You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am willing to visit my Hometown in the month of October, so please help me to book a flight from DCA.

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: Sure, my preferable dates are Oct 19th and 21st.

ASSISTANT: May I know your name please?

USER: Sure, my name is John Thompson.

ASSISTANT: May I know your destination code?

USER: My destination airport code is HOU.

ASSISTANT: Do you have any connection limit?

USER: Yes, I prefer to travel in a connected flight.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Not a problem, thank you.

ASSISTANT: Thank you for reaching us.