You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Melissa Nelson.

ASSISTANT: How can I assist you?

USER: As my budget is low, I need a flight with fare 200. Can you help me in booking?

ASSISTANT: Sure Nelson, can I know the travel dates please?

USER: My travelling dates are 06/12 to 06/14.

ASSISTANT: Could you provide the airport codes please?

USER: I will start from BOS to MSP.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: There is a flight in Delta airline with price 100, can I book it?

USER: You can book it.

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

USER: Thank you for helping.

ASSISTANT: You are welcome.