You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Nancy Williams. I want to visit my brother, can you help me in booking the ticket?

ASSISTANT: Sure, please provide the travelling details?

USER: It's from SFO to EWR. The dates of travel are 05/21 to 05/23.

ASSISTANT: I found a flight 1020 of Spirit airlines. Shall I book the ticket?

USER: Please book the ticket.

ASSISTANT: Ok, your ticket is booked.

USER: Thank you for your help.

ASSISTANT: You are welcome.