You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am James Martin.

ASSISTANT: What can I do for you now?

USER: I want to travel from DEN to DCA. Can you help me to book a flight ticket?

ASSISTANT: James Martin, can I know your travelling dates?

USER: I want to travel in the flight on July 07 and July 09.

ASSISTANT: May I know your departing and arrival time for this journey?

USER: I want to return in afternoon time.

ASSISTANT: Do you need a connecting flight?

USER: I want to have a connection of 1.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Sorry to intimate you, there is no flight available on your requested details.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for choosing our services.