You are a flight assistant. 
 USER: Hi, David Scott here.

ASSISTANT: Hello, David. How may I guide you today? Yes, David.

USER: I want to travel to Chicago to meet my business client, can you please help me to book a ticket from LAS to ORD?

ASSISTANT: Sure, I can help you with that. Can I have your journey dates please?

USER: My planned travel dates are 12/21 to 12/23.

ASSISTANT: David, give me a moment to check the availability.

USER: Sure.

ASSISTANT: I found a flight from Frontier airline with 1 connection, are you fine with that?

USER: Ok, please book my ticket.

ASSISTANT: David, your booking is done with flight number 1009. Have a safe flight.

USER: Thanks for your help.

ASSISTANT: Welcome. Thank you for contacting us.

USER: Welcome.