You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you.

USER: Shirley Johnson here. I want to book a ticket from DEN to MSP, to attend a friend marriage. Will you help me out?

ASSISTANT: I will help you. May I know your travel dates?

USER: Ok, I would like to travel on 10/19 and 10/21.

ASSISTANT: Give me a minute.

USER: Make sure price will be within 200.

ASSISTANT: Sorry, I couldn't find any flight with a price of 200.

USER: It's ok, not an issue. Thank you for your service.

ASSISTANT: Your are welcome.