You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I need to travel IAD and AUS, can you please reserve flight ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travelling dates are Jan,26 and jan,28.

ASSISTANT: Thank you, do you have any class preferences on your journey?

USER: I need a business class flight ticket.

ASSISTANT: Sure, may I know your name for the booking process?

USER: Myself Amy Johnson.

ASSISTANT: Do you have any another preferences on your trip?

USER: I need a single connection flight.

ASSISTANT: Unfortunately, no flights available on your requirements.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey.

ASSISTANT: Welcome thank you for reaching us.

USER: Thank you for the information.