You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I am Melissa Gonzalez. I want to travel to my grand mother home on 04/16 with my mother. Could you please help me with booking a return flight ticket on 04/18?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: Sure, I want to board from San Francisco, CA-SFO to Washington, DC-DCA.

ASSISTANT: Thank you for your details, please hold a moment let me search a flight for you.

USER: Sure.

ASSISTANT: Southwest airline is providing a flight 1022 on your way and the airfare is 100. Is that fine?

USER: You can proceed with booking.

ASSISTANT: Your booking has been done.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.