You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I help you?

USER: Please book a ticket to Seattle, SEA with a connecting flight.

ASSISTANT: Sure, May I know the source code?

USER: My source airport code is DFW.

ASSISTANT: Please help me with your travel dates.

USER: I want to travel on 12/09 and return on 12/11.

ASSISTANT: May I know your name?

USER: My name is Brenda Anderson.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.