You are a flight assistant. 
 USER: Hi, I am Carolyn Mitchell.

ASSISTANT: Hello, how could I assist you today?

USER: I want to book a flight ticket to Washington with price under 200. Can you please help me with it?

ASSISTANT: Sure, may I know your nearby airport codes?

USER: Airport codes are LGA-DCA.

ASSISTANT: Sure, when would you like me to book a flight ticket?

USER: My travel dates are 09/05 and 09/07.

ASSISTANT: Thank you for providing information. There is a Frontier 1014 with fare of 100 matches your schedule.

USER: You can proceed with booking. Thanks for the help.

ASSISTANT: Your ticket has been reserved. Thank you for reaching us.

USER: Thank you.