You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you?

USER: I want to travel from IAD to PHL. Can you help me to book a flight ticket?

ASSISTANT: Sure. Tell me your travel dates please?

USER: I want to fly in the flight on Aug 22 and Aug 24.

ASSISTANT: Are you looking for a stopover in your journey?

USER: I am looking for a connecting flight.

ASSISTANT: Any other preferences?

USER: I want to return in afternoon time.

ASSISTANT: May I know your name please?

USER: Pamela Walker.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you.