You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: Myself Melissa Clark, can you help me to book a flight ticket on the date 08/30 and return date is 09/01?

ASSISTANT: Sure, I am happy to help you with that. Could you provide me your airport codes?

USER: Ok, my airport codes for my travel location are PHL and DCA.

ASSISTANT: Ok, please wait for a minute.

USER: Ok, I will wait.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Ok, not a problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for assisting me.