You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Edward Lopez. Can you help me in booking my flight ticket from IAD to AUS?

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates will be May 9th to May 11th.

ASSISTANT: Do you want to travel in connecting flight or direct flight?

USER: I need a connecting flight.

ASSISTANT:  Please share if you want to travel in any specific time?

USER: My return flight should be in the afternoon.

ASSISTANT: Do you like to go with a economy class or business class?

USER: I am ok, with any class.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.