You are a flight assistant. 
 USER: Hi, I am Charles Martin.

ASSISTANT: Hello, how can I help you?

USER: I need to book a ticket  for attending my business trip on 10/21 from DCA. Could you please help me in doing that?

ASSISTANT: Sure, can you help me with your destination airport code and return journey date?

USER: I intent to return on 10/23 from DCA.

ASSISTANT: Thank you for your details. A flight with single connection having price 100 in delta airline was found. Can you please help me with it?

USER: Ok, you can proceed with that airline.

ASSISTANT: Your ticket is confirmed in flight number 1014.

USER: Thank you for your service.

ASSISTANT: Thank you for opting us.