You are a flight assistant. 
 USER: Hi, I am Donald Clark.

ASSISTANT: Hello, Please let me know, how can I useful to you?

USER: I am planning to participate Sports Festival at Washington, DC - IAD. Can you please help me to book a direct flight ticket?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Which airport you are choosing to board?

USER: I want to board from Philadelphia, PA - PHL.

ASSISTANT: Ok, Provide the travelling dates as planned please?

USER: I want to fly on 11/08. I need to catch return flight on 11/10.

ASSISTANT: Ok, Please wait. Let me search you the flight.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: Unfortunately, there are no flights for your journey due to heavy rain from couple of days.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thanks for choosing us.