You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Christopher Anderson. I am planning for a trip with my brother. Can you please help me to book my flight ticket from SFO to SEA?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, I will depart on Apr 15th and I will return back on Apr 17th.

ASSISTANT: Ok, do you need any halt in between journey?

USER: Yes, I need single halt.

ASSISTANT: Is there any other specifications?

USER: I can only pay 500 for the ticket.

ASSISTANT: Thanks for providing details, there is a flight found in UA airline with a fare of 100 and the flight number is 1002. Shall I proceed for booking?

USER: Sounds good, please book the ticket.

ASSISTANT: Ok, your ticket has been reserved in economy class.

USER: Thank you so much.

ASSISTANT: Thank you for opting us.