You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: I am Patrick Williams here, I want to reserve my ticket from DEN to DFW, can you please help me?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: Ok, my planned dates of journey are from Feb, 05 to Feb, 07.

ASSISTANT: Ok, please allow me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: You are welcome, have a great day.