You are a flight assistant. 
 USER: Hi, I am Christopher Adams.

ASSISTANT: Hello, how may I be of your service?

USER: I need to reach Austin, TX-AUS to participate in hummer tour, can you help me to book a flight ticket from San Francisco, CA-SFO?

ASSISTANT: Sure, let me know you if you prefer a connecting flight.

USER: I prefer one connection.

ASSISTANT: May I know your planned dates of travel?

USER: 11/09 and 11/11 are my planned travelling dates.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Thank you for your time. There are no flights found according to your specifications.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for opting us.