You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I want to book a direct flight ticket to attend an emergency case. Can you help me?

ASSISTANT: Sure, may I know your travelling airport codes?

USER: Thank you. CLT and DCA are my airport codes.

ASSISTANT: May I know your travelling dates?

USER: 10/24 and 10/26 are my travelling dates.

ASSISTANT:  On which name should I reserve the flight ticket?

USER: Anna Rodriguez. I need a normal-cost airline.

ASSISTANT: Do you have any other specifications?

USER: I would like to depart in the evening.

ASSISTANT: Please wait a moment, let me check best flight.

USER: Ok.

ASSISTANT: Sorry, there are no flights running on your route in the evening.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching our service.