You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Carolyn Baker.

ASSISTANT: How can I assist you today?

USER: Can you please aid me to find a flight  from Oakland to Houston?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Thank you for accepting my request. The travel dates are Oct/25 and Oct/27.

ASSISTANT: Please provide your airport codes.

USER: The source and destination airport codes are OAK and HOU.

ASSISTANT: Do you have any specifications?

USER: The return time should be afternoon from the airport IAH. Actually I have given another airport code.

ASSISTANT: Do you have any preferences?

USER: I prefer a business class flight to travel.

ASSISTANT: Do you have any other preferences?

USER: I need a single connecting flight.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

ASSISTANT: Thanks for waiting. There is no flights found under your preferable details.

USER: It's ok, not an issue with that. Anyways thank you for your time.

ASSISTANT: Welcome, have a great day.