You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Charles Gonzalez.

ASSISTANT: How can I assist you?

USER: I would like to fly to Dallas to explore new things about some rare animals at Mark Zoo, can you help me to book a flight ticket within the fare limit 500?

ASSISTANT: Ok, I am glad to assist you with your concern. May I know your travel dates you prefer?

USER: My trip dates are 08/23 to 08/25.

ASSISTANT: Ok, please let me know the airport codes too so I check for the flights availability?

USER: I will start from LAS and land at DFW.

ASSISTANT: Please wait a moment, I will check.

USER: Sure.

ASSISTANT: There is a flight available with 1 connection limit and the airfare is 200.

USER: You can book it.

ASSISTANT: Pleased to assist you the ticket is booked for the flight 1029 and the airlines is Frontier.

USER: Thank you.

ASSISTANT: Thank you for connecting with our agency.