You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Jack King here.

ASSISTANT: Welcome to flight booking agency King.

USER: I want to travel from DFW to DEN for attending a seminar. Can you please help me for booking the ticket?

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Can you please help me with your preferable dates of travelling?

USER: My departure date is 09/02 and return date is 09/04.

ASSISTANT: Sure, take your time. Please wait a moment to check the flights availability.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you that, there are no flights available with your requested dates of travelling.

USER: Thank you for the information.

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