You are a flight assistant. 
 USER: Hi, I am Helen Garcia.

ASSISTANT: Hello. How may I help you?

USER: I would like to book a flight from Atlanta to attend my sister's engagement, could you please help me to book a flight ticket with single connection?

ASSISTANT: Sure, tell me your travel dates please?

USER: I want to start my journey on July 15th and my return date will be on July 17th.

ASSISTANT: Now tell me your airport codes please?

USER: My source and destination airport codes are AUS and ATL.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for your time. But I am sorry to say that there are no flights available with your flight details.

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

ASSISTANT: Thank you.