You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Angela Gonzalez. Can you help me to book a flight ticket to Las Vegas as I have to attend a concert from IAD?

ASSISTANT: Sure, I am here to help you in booking process. Could you please share me your travel dates?

USER: Ok, please book for the dates May 19 and May 21.

ASSISTANT: Ok, may I know your destination airport code?

USER: Ok, please book a flight to NV - LAS airport.

ASSISTANT: Please wait a moment.

USER: Ok, I will wait for your response. Please check for a connecting flight.

ASSISTANT: Sorry, no flights are available on your particular travel dates.

USER: That is ok, thank you for the help provided.

ASSISTANT: Thank you for reaching us, have a nice day.