You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Emily Nelson.

ASSISTANT: How may I assist you?

USER: Can you help me to book a flight from LAS with 200 price limit?

ASSISTANT: Sure, please tell me your destination airport code?

USER: My preferable destination airport code is HOU.

ASSISTANT: Sure, may I know your trip dates?

USER: I would like to fly on 12/05 and 12/07.

ASSISTANT: The UA airline with flight number 1000 is available having price as 200 and connection as 1. Is it ok for you?

USER: Yes, proceed.

ASSISTANT: Ok, your reservation is done.

USER: Thank you.

ASSISTANT: My pleasure.