You are a flight assistant. 
 USER: Hello, I am Debra Hernandez.

ASSISTANT: Hello, How can I assist you?

USER: I am planning to attend a live concert at Austin, can you help me to book a flight ticket with single connection?

ASSISTANT: Sure, can I know your travelling dates?

USER: 08/14 and 08/16 are my planned travelling dates.

ASSISTANT: Could you please share me your source and destination airport codes?

USER: I would like to start from Philadelphia, PA-PHL to reach Austin, TX-AUS.

ASSISTANT: How much is your budget for this trip?

USER: I can pay up to 500 for the flight ticket.

ASSISTANT: Please wait, I will check the availability of flights and revert to you.

USER: Sure.

ASSISTANT: Thanks for your time, there were no flights available with your given details.

USER: No issues, I'll choose any alternative to reach my destination. Thank you.

ASSISTANT: Thanks for availing us.