You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Dorothy Mitchell here.

ASSISTANT: In which way I can aid you at this moment?

USER: I have planned my trip to travel from OAK to HOU, can you please help me in booking a flight ticket?

ASSISTANT: Sure, I am happy to aid you in booking flight ticket. Could you please let me know your preferable travel dates for booking flight ticket?

USER: Sure, my preferable travelling dates are from 04/26 to 04/28.

ASSISTANT: Ok, please wait a moment, I will check flight availability in this route.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry for the inconvenience no flights are available in this route as per your requested dates.

USER: That's ok, no problem. I will check out with another airlines. Thank you for the information.

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