You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, May I know your name?

USER: Charles Miller is my name.

ASSISTANT: How can I aid you today?

USER: I need to visit my grand parents in Washington, DC - IAD on 04/26.Can you book a flight ticket?

ASSISTANT: Sure, May I know your source point?

USER: I would start from Chicago, IL - ORD and return on 04/28.

ASSISTANT: Do you have any other criteria to met?

USER: I need one connection with price 5000.

ASSISTANT: Ok, please wait a moment I will check and let you know the details.

USER: Sure.

ASSISTANT: There is a frontier airline with flight number 1007 matches with your requirement. Price is 100 and 1 connection. Shall I proceed with booking?

USER: You can proceed.

ASSISTANT: Ok, your flight is confirmed.

USER: Thanks for booking.

ASSISTANT: Thank you for reaching us.