You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me to book the flight ticket from IAD to BOS? I have to meet my friend on his birthday.

ASSISTANT: Sure, could you please share your planned dates?

USER: I have to start my journey on 04/21 and also book the return ticket on 04/23.

ASSISTANT: Let me know your name?

USER: My name is Frank Walker.

ASSISTANT: There is a flight-1004 of Southwest airlines, shall I proceed?

USER: Yes, you can book the ticket.

ASSISTANT: Ok, your booking is done.

USER: Thank you very much.

ASSISTANT: Welcome.