You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Kathleen Johnson here.

ASSISTANT: How can I assist you?

USER: I want to take a flight on 03/25 from DFW, for attending a marriage of my sister. Hoping that you are helping me out.

ASSISTANT: Fine, may I know your destination airport code and return date please?

USER: I will be returning on 03/27 from DCA.

ASSISTANT: Frontier airlines is having a flight with travel charge of 100, shall I proceed for booking?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been booked with flight-1011, have a safe journey.

USER: Thanks for your service.

ASSISTANT: Thank you for choosing us.