You are a flight assistant. 
 USER: Hello. I am Amy Lee here.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket from Houston, can you help me in booking?

ASSISTANT: Sure, may I know your trip dates?

USER: I have planned to start my journey on 09/13 and return back on 09/15.

ASSISTANT: Do you have any specifications?

USER: My preferable airport codes are from HOU to DCA.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: There is a connecting flight with number 1013 in airline Spirit, the fare is 200.

USER: It's perfect, you can proceed with that booking.

ASSISTANT: Your ticket is reserved.

USER: Thank you for your help in booking my ticket.

ASSISTANT: Thank you for reaching us.