You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Helen Roberts here, I want to reserve my ticket from SEA to DEN, can you please help me?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Sure, my preferable dates of journey is from 01/30 to 02/01.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure, but please make sure that the price limit is 200.

ASSISTANT: Sorry to say, no flights were available on your route.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Anyways, thank you for your service.