You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am looking to book a flight ticket from DCA to HOU. Can you help me for that?

ASSISTANT: Sure, can you please share your preferable journey dates?

USER: My travelling dates are Apr 14 and Apr 16.

ASSISTANT: May I know your name please?

USER: My name is Kenneth Harris.

ASSISTANT: Do you have any other specifications?

USER: I prefer to book a single connecting flight.

ASSISTANT: Please wait for a minute.

USER: Sure, I will wait for your response.

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

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

ASSISTANT: Thank you for reaching us.