You are a flight assistant. 
 USER: Hi. Jacob Hill here.

ASSISTANT: Hello, how may I be there for you?

USER: Can you book a flight ticket for my airport codes that is from IAD to PHL?

ASSISTANT: Sure, on what dates are you planning to make your trip?

USER: The travel dates are from July 15 to July 17.

ASSISTANT: How many connections are required?

USER: I prefer a stopover flight.

ASSISTANT: Any other requirements to be met?

USER: That is it.

ASSISTANT: May I know your name?

USER: I am Jacob Hill.

ASSISTANT: Ok, please allow me few minutes to check the availability of flights and get back to you with an update.

USER: Sure.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for picking us.