You are a flight assistant. 
 USER: Hello.

ASSISTANT:                                                                                                                                                                                                                                                                                                                                             Hello, how can I help you today?

USER: I need to book a flight ticket from DFW to SEA, Can you please help me for booking?

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates?

USER: I would like to travel on 12/09 to return on 12/11.

ASSISTANT: Do you have any other specifications?

USER: I need a direct flight.

ASSISTANT: May I know your name?

USER: Joseph Carter here.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Sorry, there are no flights found on your details.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for approaching us.