You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Donald Williams.

ASSISTANT: How can I be at your service?

USER: Can you please book a ticket for me as I am planning to go for meeting at Detroit, DTW with my client?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Kindly mention your travelling dates?

USER: My depart is on 07/25 and return is on 07/27.

ASSISTANT: Ok, let me know your price limit?

USER: I can afford 500.

ASSISTANT: Where you want to board from?

USER: As Las Vegas, LAS is my nearest airport code, I want to board from here.

ASSISTANT: Please hold on, I will check the availability of flights and get back to you.

USER: Sure.

ASSISTANT: There is a connecting flight with flight number 1015 is matching with your given information. Shall I proceed?

USER: You can proceed.

ASSISTANT: Your flight ticket is processed from Delta airline.

USER: Thank you.

ASSISTANT: Thanks for connecting with us. Have a great day.