You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please reserve me a flight ticket from PHX to IAD, as I have to attend a business meeting at Washington?

ASSISTANT: Let me know your travelling dates.

USER: Sure, my preferable travel dates are from Oct 18 to Oct 20.

ASSISTANT: Do you have any preference?

USER: I would prefer connecting flight for my trip.

ASSISTANT: Can I know your name?

USER: Myself Betty Lopez.

ASSISTANT: Sorry, no flights found for your travelling dates.

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

ASSISTANT: Thank you.