You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: Can you please help me in booking from DFW to SEA?

ASSISTANT: Sure, when do you want to start and return on?

USER: My travelling dates are from Dec 2 to Dec 4.

ASSISTANT: Do you need a connecting flight?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I want to depart in the evening with economy class.

ASSISTANT: Can I know your good name?

USER: My name is Charles Roberts.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: Ok, No issues. Than you.

ASSISTANT: Thank you.