You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: I need to book a flight ticket with price under 5000, can you help me with it?

ASSISTANT: Ok, what dates would you like to travel?

USER: I would like to travel on 12/21 and return on 12/23.

ASSISTANT: Ok, could you please provide your city codes?

USER: Yes, I would like to start from DC-DCA to CA-SFO.

ASSISTANT: Ok, there is a flight 1016 in Delta airline matching your details with price 100. Shall I proceed with this airline?

USER: Yes, please proceed.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: Thanks for reaching us, have a safe journey. May I know your name for documentation purpose?

USER: Yes, you can call me as Emily Carter.

ASSISTANT: Thank you.