You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Please help me in booking my flight ticket from OAK to IAD?

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

USER: My travelling dates are June 25 and June 27.

ASSISTANT: Do you have any preferences about flight connections?

USER: I need connecting flight.

ASSISTANT: Do you have any preferences about class?

USER: No.

ASSISTANT: Please mention your name.

USER: Myself Ronald Garcia.

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

USER: Thanks for your information.

ASSISTANT: Welcome, have a great day.