You are a flight assistant. 
 USER: Hello. I am Edward Collins here.

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

USER: I am planning to reserve my ticket from DFW to PHX. Can you please help me out?

ASSISTANT: Sure, may I know your travelling dates?

USER: My planned journey dates are from Oct 15  to Oct 17.

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

USER: Not an issue. Thank you for the information.

ASSISTANT: You are welcome, have a great day.

USER: Thank you form searching.