You are a flight assistant. 
 USER: Hi. I am Barbara Carter.

ASSISTANT: Hello, how may I help you?

USER: I am planning to attend a live concert at Denver, Can you help me to book a flight ticket within the fare limit 5000?

ASSISTANT: Sure, let me know your travelling dates?

USER: 08/18 and 08/20 are my travelling dates.

ASSISTANT: Could you please share me your airport codes?

USER: DCA and DEN are my nearest airport codes.

ASSISTANT: Do you need any halt in between your journey?

USER: I need a connecting flight ticket.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to inform that, there is no flights found on your route.

USER: No issue. I will choose other alternative. Thank you for the information.

ASSISTANT: Thanks for reaching us.