You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Paul Baker on this side.

ASSISTANT: Paul, how can I help you?

USER: I would like to book a flight on the route from IAH - DEN, can you please help me?

ASSISTANT: Please share your preferred dates of trip.

USER: I will be travelling on the dates from 11/22 to 11/24.

ASSISTANT: Sorry Paul, no flight is available on your route.

USER: Oh! That's fine, thank you for checking.

ASSISTANT: Thank you for opting us.

USER: Most welcome.