You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: I want to reserve my ticket from DCA to AUS, can you please help me in booking?

ASSISTANT: Sure, I am here to help you now. May I know your travel dates, please?

USER: Sure, my planned dates of journey are from Feb, 15 to Feb, 17.

ASSISTANT: May I know your connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you have any class preference?

USER: No, I need a depart time at afternoon.

ASSISTANT: Do you have any more specifications?

USER: Not required.

ASSISTANT: Please, provide me your name to proceed further for documentation purpose.

USER: Sure, my name is Christopher Carter.

ASSISTANT: Sorry, there are no flights found on your desired routes.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you for reaching us.