You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Joseph Campbell. Can you please book me a flight from SFO to meet my friends who are staying at TX-AUS?

ASSISTANT: Sure, I am glad to assist you, Can you please let me know your travel dates?

USER: Sure, my planned trip dates are July 15th and 17th.

ASSISTANT: Ok, do you have any preferences?

USER: I need a single connecting flight.

ASSISTANT: Ok, please wait for sometime.

USER: Ok, sure.

ASSISTANT: Sorry to inform you that, there is no flight available on your preferred travel dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: You are welcome and thank you for choosing us.