You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you for the day?

USER: Please make a reservation with the name of Nicole Mitchell to IAD from DCA.

ASSISTANT: Sure, when you are planning to make your journey?

USER: My travelling dates are Aug 03 and Aug 05.

ASSISTANT: How much you can spend for airfare?

USER: I can afford up to 200 for a ticket.

ASSISTANT: Sorry we did not find any flights matching your criteria.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.