You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to make trip to Dallas, can you please make a reservation from DEN to DFW?

ASSISTANT: Yes, can you tell me your travelling dates?

USER: My journey dates are on Apr 19th and 21st.

ASSISTANT: Do you have any other specifications?

USER: I need one stopover in between journey.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Can I know your name?

USER: My name is Brandon Brown.

ASSISTANT: Thank you for contacting us.