You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am planning to visit a Austin from SFO to AUS. can you find a flight ticket for me?

ASSISTANT: Ok, may I know your trip dates?

USER: Sure, my trip dates are 07/15 and 07/17.

ASSISTANT: Ok, please wait.

USER: Ok, make sure that the connection limit 1.

ASSISTANT: May I know your name?

USER: Yes, I am Catherine Mitchell.

ASSISTANT: Sorry, no flights found on your preferable dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Most welcome.