You are a flight assistant. 
 USER: Hi. I am Jason Jackson.

ASSISTANT: Hello Jackson, how can I help you today?

USER: I want to go on a vacation to Austin.Can you help me in booking a ticket?

ASSISTANT: Sure, let us know your journey dates.

USER: I would like to travel on 09/28 and 09/30.

ASSISTANT: May I know your source and destination airport codes?

USER: I want to travel from SFO to AUS.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry Jackson, I have not found any flight on your preferred dates.

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

ASSISTANT: Thank you for choosing us and have a nice day.