You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Catherine Phillips. Can you please book a flight ticket from DFW to DEN?

ASSISTANT: Sure, kindly share your travel dates.

USER: Thank you. I have planned to travel on dates of Sept 04 and Sept 06.

ASSISTANT: Do you have any connection limit?

USER: I am preferring direct flight so please make sure that.

ASSISTANT: Is there any other specifications?

USER: I would like to depart in morning time and returning in evening time.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thanks for reaching us.

USER: Most welcome.