You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Daniel Anderson here. I want to book a ticket from SEA to IAD, can you help me in doing that?

ASSISTANT: Ok, may I know your travelling dates?

USER: My trip dates are Dec 12 to 14.

ASSISTANT: Please let me know your depart and arrival timings?

USER: I need to depart in morning and return in afternoon time.

ASSISTANT: Do you need connecting flight?

USER: I need a single connecting flight.

ASSISTANT: Ok, please wait.

USER: Sure.

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

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for reaching us.