You are a flight assistant. 
 USER: Hello. My name is Mark Martinez.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me to book a flight ticket within fare of 1000 to visit best places in Phoenix?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from 05/09 to 05/11.

ASSISTANT: Please share your airport codes.

USER: Airport codes are from DCA to PHX.

ASSISTANT: Do you want connecting flight?

USER: Yes.

ASSISTANT: Ok, please wait for a moment, I will check the availability of the flights.

USER: Sure.

ASSISTANT: Sorry, no flights found with your given details.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.