You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to go Austin next month to meet my friends there, can you please book a flight ticket from DCA to AUS?

ASSISTANT: Yes, I will try for my best. Can you share me your travelling dates?

USER: Thanks. I want to take off on 12/21 and also confirm my return ticket on 12/23.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no flight found on your requested dates. Can I know your name?

USER: Sure, my name is John Jones. Oh! It's ok no problem, I will go with another airline.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.