You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself Christopher Thomas. I need to travel Seattle, can you please reserve flight ticket from OAK and SEA?

ASSISTANT: Sure, can I know your travelling dates?

USER: My travelling dates are Jan,11 and Jan,13.

ASSISTANT: Do you have any particular time for departing and returning?

USER: My return time should be in the afternoon.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need a single connection for my travel.

ASSISTANT: Which class do you prefer?

USER: I am ok with any flight which is available.

ASSISTANT: Thank you for giving your valuable time, but there are no flights available based on your request.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey. Thank you for the information.

ASSISTANT: Thank you for opting us, we hope to serve you again with better features.