You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am Margaret Martinez. As I have to meet my office heads at Washington on 03/05. I want to book a ticket from IAH with 1 connection.

ASSISTANT: Ok, could you please provide your destination?

USER: My destination is to DCA with the price limit of 500. I have to return on 03/07.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: We are sorry to notify you that there is no flights found based in your details.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you, have a nice day.