You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Benjamin Moore from Washington.

ASSISTANT: Nice to meet you Benjamin.

USER: Thanks, nice to meet you too. I want to go to Austin next week, can you please book a flight ticket for me?

ASSISTANT: Sure, may I know your airport codes please?

USER: I want to fly from DCA and destination airport is AUS.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Ok, now please tell me your travel dates?

USER: I want to take off on 04/08 and book my return ticket also on 04/10.

ASSISTANT: Thank you for providing details. But I am sorry to say that presently there are no flights available.

USER: Oh! It's ok no problem, I will go with another airline.

ASSISTANT: Thank you.

USER: Thank you for your service.