You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I serve you?

USER: Please assist me in booking flight ticket from Washington, to reach Austin? Can you help me with a connecting flight ?

ASSISTANT: Sure, may I know when do you want to travel?

USER: I want to travel on 08/31 and return on 09/02.

ASSISTANT: How much fare are you expecting?

USER: I am expecting that, the ticket fare is in range 500.

ASSISTANT: Kindly mention your airport codes.

USER:  Boarding is from DC - DCA, and destination is at TX - AUS.

ASSISTANT: May I know your name?

USER:  Sure, Shirley Wright is my name.

ASSISTANT: Thanks for sharing your details. There are no flights available on your required dates.

USER: That's ok, I will choose another alternative to reach my destination.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your help.