You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Martinez.

ASSISTANT: How can I assist you today?

USER: I am planning to book a ticket to meet my family at SEA. Can you please help me out from DFW?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: I would like to travel on 10/12 and return back on 10/14.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flights available under your preferable details.

USER: That's fine, thank you for your service.

ASSISTANT: Welcome, have a great day.