You are a flight assistant. 
 USER: Hello. I am Mark Clark.

ASSISTANT: Hello, how may I assist you?

USER: I would like to attend for science fair event which is going to be held at Austin.

ASSISTANT: Ok.

USER: Will you please assist me in making a reservation to reach AUS on 07/04?

ASSISTANT: Sure, we are cheerful to help you. May I know your price limit?

USER: It should be under 200.

ASSISTANT: Kindly, mention your return date.

USER: My return will be on 07/06.

ASSISTANT: Can you share your airport codes?

USER: My boarding point is IAD.

ASSISTANT: Thank you for providing your information. Please hold on.

USER: Ok.

ASSISTANT: Thank you for your patience. There is no flight found on your journey locations.

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

ASSISTANT: Thank you for choosing us, have a Blissful day.