You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Nancy Jones here. Do you have any direct flight on 12/21?

ASSISTANT: Yes, may I know your locations which you want to travel?

USER: I would like to travel from LAS to DFW.

ASSISTANT: Do you have any return journey date?

USER: Yes, I want return on 12/23.

ASSISTANT: Thanks for your information, please hold on a minute.

USER: Sure, take your own time.

ASSISTANT: Thanks for your time, there is no flight found on your route to book your ticket.

USER: That's fine, thanks for your information and time.

ASSISTANT: Welcome Nancy Jones, thanks for contacting us.