You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Will you please help me with booking a flight ticket from DFW to DCA?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your travelling dates?

USER: My planned travel dates are from Dec 24 to Dec 26.

ASSISTANT: On whose name I have to book the flight ticket?

USER: Ok, you can book this ticket in the name of Sharon Scott.

ASSISTANT: Are you ok with connecting flight?

USER: Yes, I am looking for a  connecting flight in my journey.

ASSISTANT: Any other specifications do you have?

USER: I would prefer not to fly a low-cost airlines.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure, I will wait for your response.

ASSISTANT: We regret to inform you that, only low-cost airlines are available for your journey with your requested dates of travelling.

USER: Ok, but I need a normal cost Airlines. Thank you for the information.

ASSISTANT: Sorry, no flights are available. Thank you for reaching us.

USER: Thank you for your service.