You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I'm Melissa Allen.

ASSISTANT: Ok.

USER: I am planning to travel from PHX to AUS to attend my sister's wedding anniversary, can you please help me with booking a flight ticket?

ASSISTANT: Sure, I am happy to help you. May I know the travelling dates of your journey?

USER: Sure, my departure date is on 06/26 and the return date is on 06/28.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, please make sure that price limit should not exceed 500.

ASSISTANT: Sorry for the inconvenience, there are no flights found on your requirement.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thank you for checking.

ASSISTANT: You are welcome.