You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I guide you today?

USER: I want to book a ticket from DCA to LAX, can you help me?

ASSISTANT: May I know your travelling dates?

USER: My travel dates are 09/25 and 09/27.

ASSISTANT: Can you please let me know your class preference?

USER: I prefer to travel in business class.

ASSISTANT: May I know your connection limit?

USER: I need connecting flight.

ASSISTANT: Can I know your name?

USER: I am Emma Miller.

ASSISTANT: Sorry, no flights available on your route to reserve your ticket.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us.