You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Can you please reserve me a ticket from DCA to IAH?

ASSISTANT: Sure, may I know your travel dates?

USER: My travel dates are from Feb 15th to Feb 17th.

ASSISTANT: Do you have any specifications?

USER: I need to depart in the afternoon. I want a connection in between my journey.

ASSISTANT: Is there any airline preference?

USER: I prefer a normal-cost airline.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no problem.

ASSISTANT: May I know your name?

USER: I am Margaret Williams.

ASSISTANT: Thank you.

USER: Thank you.