You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How could I aid you today?

USER: Helen Martinez here. Can you please book me a flight ticket from New York, NY - JFK to reach Washington, DC - DCA?

ASSISTANT: Can you please share me your budget for flight ticket?

USER: I can afford up to 200 only.

ASSISTANT: May I know when you are willing to travel?

USER: My travel dates are 11/07 - 11/09.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Unfortunately there are no flights found with your given information.

USER: Not a problem, thank you.

ASSISTANT: Thank you for choosing us.