You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am planning to book a ticket from IAD to AUS to meet my uncle, can you help me in booking?

ASSISTANT: Sure, can I know your journey dates?

USER: I am departing on 08/20 and return on 08/22.

ASSISTANT: Give me a minute.

USER: Sure, take your time.

ASSISTANT: May I know your name?

USER: My name is Rebecca Young.

ASSISTANT: Sorry, there is no flight on your requested dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for opting us.