You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I'm Jonathan Scott.I am planning to attend a sports event at Austin, can you please help me with booking a flight ticket?

ASSISTANT: Sure Jonathan. May I know your travelling dates which you are planning for?

USER: Sure, my departure date is on 07/15 and the return date is on 07/17.

ASSISTANT: Ok, could you please provide me your airport codes?

USER: Sure, it is from SFO to AUS. Please make sure that the price limit should not exceed 1000.

ASSISTANT: Ok, let me check.

USER: Sure.

ASSISTANT: Sorry to say Jonathan, there is no available flight at your requested dates.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: You are welcome. Thank you for contacting us.Have a good day.

USER: You are welcome.