You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Jeffrey Turner. Can you please book a flight ticket from IAD to PHL?

ASSISTANT: Sure, May I know the travel dates?

USER: I would like to travel on Aug 26 and need to return on Aug 28.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for availing us.