You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Samantha Mitchell.

ASSISTANT: How can I assist you?

USER: I want to watch a live football match at Washington. Can you book a flight with price limit 5000.

ASSISTANT: May I know your travelling dates?

USER: My journey dates are from 07/22 to 07/24.

ASSISTANT: May I know your trip codes?

USER: My airport codes are from PHL to DCA.

ASSISTANT: Sorry no flight found on your details.

USER: Ok. Thank you for your information.

ASSISTANT: Thank you for contacting us.