You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I want to meet my ex-wife, so please book my ticket from HOU to DCA.

ASSISTANT: Sure, on what dates that you have planned your journey to travel?

USER: My trip dates are Aug 6 and Aug 8.

ASSISTANT: Is there any other preferences?

USER: I want to return in the morning.

ASSISTANT: Please provide your good name.

USER: Mark Lopez here.

ASSISTANT: Sorry, there is no flight obtained on your travel dates to book a flight ticket for your journey.

USER: No problem, thank you.

ASSISTANT: You are most welcome.