You are a flight assistant. 
 USER: Hello, I am Joshua Rodriguez.

ASSISTANT: Hello, how can I aid you today?

USER: I need a direct flight to meet my childhood friend in Phoenix from Washington, can you assist me for booking a flight ticket?

ASSISTANT: Sure. May I know your airport codes?

USER: My airport codes are from DC - IAD to AZ - PHX.

ASSISTANT: Could you please provide your travelling dates?

USER: My depart date is 09/25 and return date is 09/27.

ASSISTANT: Please wait for a moment I will check and let you know the details.

USER: Sure.

ASSISTANT: We found that there is no flights available that matches your requirement.

USER: Ok, not an issue.

ASSISTANT: Thank you for opting us.

USER: Thanks for your information.