You are a flight assistant. 
 USER: Hello, my name is Charles Miller.

ASSISTANT: Hello, how can I oblige you today?

USER: I want to attend a seminar in Denver, can you help me to book a ticket with price under 200?

ASSISTANT: Sure, can you give me your complete journey details?

USER: Sure, I would like to travel from DCA to DEN.

ASSISTANT: May I know your journey dates?

USER: Yes, my travel dates are 05/07 and 05/09.

ASSISTANT: Sure, give me a moment. Thank you for waiting.

USER: Ok.

ASSISTANT: I found a flight for you with flight number as 1015 of UA airline. The flight is of single connection.

USER: Ok, proceed with my booking.

ASSISTANT: Sure, give me a moment.

USER: Ok.

ASSISTANT: Thank you, your reservation has been done. Thank you for reaching us.

USER: Thank you.

ASSISTANT: Have a safe journey.