You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I have to attend a Live Concert at Las Vegas, could you please help me with booking a flight ticket from HOU to LAS?

ASSISTANT: Can you share your trip dates?

USER: I would like to depart on Sept 18th and return on Sept 20th.

ASSISTANT: Do you need any connections?

USER: I am looking for a direct flight.

ASSISTANT: Are there any other preferences?

USER: I have no other preferences.

ASSISTANT: May I know your name?

USER: I am Mary Adams.

ASSISTANT: Sorry, there is no flight found with your details.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.