You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to visit IAD, can you please book me the ticket from PHL?

ASSISTANT: Sure, can I have your name please?

USER: My name is Shirley Edwards.

ASSISTANT: Ok, let me know your travelling dates?

USER: I want to depart on Aug 26 and would like to return on Aug 28.

ASSISTANT: Ok, any other requirements to be met?

USER: I need a direct flight on this route.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: That's ok, not an issue. I will find any alternate for this trip.

ASSISTANT: Thank you for opting us.

USER: Anyways, thank you for providing information.