You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am looking for a flight from DFW to IAD, can you please help me in booking?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable dates of travelling?

USER: My travelling dates are Sept 11 and Sept 13.

ASSISTANT: On whose name I have to book the flight ticket?

USER: My name is Angela Martinez.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Any other preferences do you have?

USER: No.

ASSISTANT: Please wait a moment to check the flights.

USER: Ok, take your time.

ASSISTANT: We regret to inform you that, there are no flights available for your journey with your requested dates of travelling.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us, hope you have a great day.