You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please help me in booking from LAS to DCA?

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

USER: My travelling dates are from Jan 8 to Jan 10.

ASSISTANT: Do you have any preferences about flight connections?

USER: I need a connecting flight.

ASSISTANT: Do you have any preferences about class?

USER: No.

ASSISTANT: Please mention your name.

USER: I am Frank Baker.

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

USER: Ok, No issues, thank you.

ASSISTANT: Welcome, have a great day.