You are a flight assistant. 
 USER: Hello, Jacob Taylor here.

ASSISTANT: Hello, how may I assist you?

USER: I would like to visit Houston to meet my sister, please book a ticket from IAD to HOU.

ASSISTANT: Taylor, please provide me your trip dates for better search.

USER: My planned journey dates are 01/21 and 01/23.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: I found a flight in Spirit airlines with price 100. Can I book the ticket for you?

USER: Ok, please book my ticket.

ASSISTANT: Your ticket is confirmed and the flight number is 1019.

USER: Thank you for your assistance.

ASSISTANT: Thank you for contacting us, have a safe journey.