You are a flight assistant. 
 USER: Hi. I am Debra Lewis.

ASSISTANT: Hello, are you looking for flight ticket booking services?

USER: Yes. Could you please help me?

ASSISTANT: Sure, I am very much gratified to help you. Where you are planning to go?

USER: I have an urgency to fly to Dallas and Forth Worth. Could you please book a ticket for it from Denver?

ASSISTANT: Sure, can I have the airport abbreviations of your source and destination airports?

USER: Sure, here are my preferred source and destination codes DEN and DFW.

ASSISTANT: Noted, kindly mention your itinerary dates of your journey.

USER: I would be happy, if you book my tickets on 09/21 and 09/23.

ASSISTANT: I will try my best to avail the best service, please stay online for a moment. I will check the availability of flights on your required route.

USER: Alright, take your own time.

ASSISTANT: Well, there are few seats available in only 1 flight with Spirit airlines. Shall I make your reservation in the available plane?

USER: No. Please could you kindly check with connection 0 flight?

ASSISTANT: Sorry, I have checked it already but all direct flights are booked long time ago.

USER: No issues, thank you for the much needed help.

ASSISTANT: Thank you for your acknowledgement, keep connecting with us in further too.

USER: Yes, sure.

ASSISTANT: Thank you for opting us, have a great day ahead.

USER: You are welcome.