You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: I want to book a flight ticket from Washington, can you please book a ticket in business class?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are Oct 13 and Oct 15.

ASSISTANT: May I know your connection limit?

USER:     I need a connecting flight.

ASSISTANT: Which class do you prefer?

USER:     I have mentioned above.

ASSISTANT: At what time do you travel?

USER: I want to depart at evening.

ASSISTANT: Can I know your airport codes?

USER: My airport codes are IAD and ATL.

ASSISTANT: May I know your name?

USER:         My name is Melissa Gonzalez.

ASSISTANT: There are no flights available.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for choosing us.