You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name please?

USER: Yes, you can call me as Robert Edwards.

ASSISTANT: How may I assist you?

USER: I need to book a flight ticket from Houston on 07/17 as I have business meeting at Washington and I want to return on 07/19, can you help me with the booking?

ASSISTANT: Sure, I am at your service. May I have your airport codes?

USER: Yes, my airport codes are IAH and IAD.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a connection in between.

ASSISTANT: I am sorry to say there are no flights found for your requirement.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for choosing us as your replacement.