You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: Can you please help me with booking a flight ticket from PHL to IAD?

ASSISTANT: Sure, kindly provide your travel dates.

USER: My travelling dates are from Sept 25-27.

ASSISTANT: Is there any connection limit?

USER: I would be comfortable with single stop over.

ASSISTANT: Do you have any other requirements?

USER: I prefer to fly major airlines.

ASSISTANT: May I know your name?

USER: Charles Edwards here.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for contacting us.