You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Cynthia Clark and book a ticket under the price limit of 200 on 08/18.

ASSISTANT: Sure, please provide me your airport codes.

USER: I have to fly from Denver, DEN to reach the Las Vegas, LAS .

ASSISTANT: Can I have your return date please?

USER: 08/20 is my return date.

ASSISTANT: Do you need any flag stop in between your journey?

USER: Yes, I need.

ASSISTANT: Sorry, there are no connecting flights at this moment.

USER: No worries at all.

ASSISTANT: Have a good day.