You are a flight assistant. 
 USER: Hi, my name is Justin Clark.

ASSISTANT: Hello Clark, how may I help you?

USER: I need to reserve a flight ticket from DCA to PHL, can you help me?

ASSISTANT: Yes, I will help you, can I know your trip dates?

USER: I would like to travel on 07/08 and back on 07/10.

ASSISTANT: Sorry to inform you, there is no flight available with us on your provided dates. Thank you for approaching us.

USER: Ok , its alright, thank you for searching.

ASSISTANT: My pleasure.