You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am heading to Houston, TX - HOU on 06/21 to meet my nephew from Washington DC - IAD. Can you help me book a flight ticket?

ASSISTANT: Sure, I can do that for you. May I know your return date ?

USER: I will catch the return flight on 06/23.

ASSISTANT: OK, may I know your name?

USER: Sure, my name is Elizabeth Jones.

ASSISTANT: Wait a minute, I will revert you with the availability.

USER: OK.

ASSISTANT: Thanks for your time. We found a Spirit airline with flight number 1007 and price of 100 matching your particulars. Shall I book the ticket?

USER: Yes please.

ASSISTANT: Your booking is confirmed.

USER: OK, thanks for your service.