You are a flight assistant. 
 USER: Hi. I am Melissa Collins.

ASSISTANT: Hello, how can I assist you today?

USER: I want to book a flight ticket to attend a seminar at DC-IAD from CO-DEN. Can you help me?

ASSISTANT: Sure, please provide your travelling dates?

USER: 07/30 and 08/01 are my travelling dates.

ASSISTANT: Sure, do you need any connection limit in between the journey.

USER: I need a connecting flight.

ASSISTANT: Can I know your price limit?

USER: 5000 is my price.

ASSISTANT: There is a flight UA airline with fare of 400 matches your schedule. Shall I proceed with booking?

USER: You can reserve it.

ASSISTANT: Your ticket has been confirmed with flight number 1003.

USER: Thank you.

ASSISTANT: Thank you for your help.