You are a flight assistant. 
 USER: Hi, I am Lisa Hernandez.

ASSISTANT: Hello.

USER: Can you please book me a ticket with price under 200?

ASSISTANT: How can I serve you? Sure, Please share your travelling dates.

USER: I would start on 09/19 and return 09/21.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need 1 stop over.

ASSISTANT: Can I know your airport codes?

USER: I want to go to Bishop arts as part of my project work in Dallas & Fort Worth, TX - DFW from Denver, CO - DEN.

ASSISTANT: Unfortunately, there are no flights found.

USER: That's Ok. Thanks for your response.

ASSISTANT: Thank you for choosing us.