You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Charles Lee, I am planning to take a tour at Space Center Houston to see the history of space of U.S. Can you book a flight on 04/30 and return ticket on 05/02?

ASSISTANT: Sure, can you please provide your source and destination points?

USER: My source point is CO-DEN and destination is TX-HOU.

ASSISTANT: Do you need any halt in between journey?

USER: Yes, I want a connecting flight.

ASSISTANT: Kindly mention your budget for airfare?

USER: My budget is 1000.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your time, sorry, we have a direct flight on that day.

USER: Ok, thank you for the details.

ASSISTANT: Thank you for approaching us.