You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Christopher Lewis here. I would like to meet my friend at Austin, can you please help me in booking a flight ticket from OAK to AUS?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Sure, my journey dates are from 08/20 to 08/22.

ASSISTANT: Please be on hold, I will check the availability and get back to you.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say, no flights were available on your route.

USER: That's ok, no problem. Thank you for checking out.

ASSISTANT: Thank you for reaching us, have a nice day.