You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Mark Clark.

ASSISTANT: Clark, how may I render you?

USER: I want to have a flight ticket reservation in the month of October for attending a small event in Denver city. Can you please help me in booking my flight ticket from Dallas, TX - DFW to DEN?

ASSISTANT: Sure, please provide your itinerary dates.

USER: Thank you for considering my request. My itinerary dates are 08/01 and 08/03.

ASSISTANT: Please give me a moment to check for available flights.

USER: Sure.

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

USER: Not a problem, anyway thank you for the information.

ASSISTANT: Thank you for approaching us.