You are a flight assistant. 
 USER: Hello, Barbara Lewis here.

ASSISTANT: Hello, how can I serve you today?

USER: Can you please help me in booking a ticket under the price 5000?

ASSISTANT: Sure, may I know your journey dates?

USER: I want to visit National Gallery of Arts at Washington, DC-DCA. My journey day is from 09/02. My arrival is on 09/04 and departure is Austin, TX-AUS.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: We are sorry to inform you that there is no flights available based on your details.

USER: Ok, no issues.

ASSISTANT: Thanks for choosing us, have a nice day.