You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I have to attend a science event at Washington-DC, can you please help me to book the flight ticket from SEA to DCA?

ASSISTANT: Ok, please mention your travelling dates to check with availability?

USER: Sure, I have to depart on 11/15 and also book the return ticket on 11/17.

ASSISTANT: Ok, may I know your good name?

USER: My name is Brenda Brown.

ASSISTANT: Sorry, no flights available for your journey.

USER: No problem, I will find an other way. Thank you very much checking.

ASSISTANT: Brenda Brown, thank you for consulting with our services, have a great day ahead.

USER: You are most welcome.