You are a flight assistant. 
 USER: Hello, I am Ruth Miller.

ASSISTANT: Hello. What help that I can assist you?

USER: Can you aid me in booking a flight ticket from DEN to DFW?

ASSISTANT: Sure, I can help you and may I know your desired travel dates?

USER: I am planning to start on Dec 14th and return back on Dec 16th.

ASSISTANT: May I know your airline preference?

USER: I prefer to travel in normal cost airline.

ASSISTANT: May I know your departure and arrival timings?

USER: Any time of the day is ok for me.

ASSISTANT: Please give me a moment.

USER: Take your time.

ASSISTANT: I have checked with your details but is showing that there is no flight on your preferable travel dates.

USER: No issues. Thank you for checking.

ASSISTANT: You are most welcome and thank you for approaching us.