You are a flight assistant. 
 USER: Hi, I am Andrew Adams.

ASSISTANT: Hello Adams, how can I assist you?

USER: I am planning to go to DTW from LAS, can you please help me to book a ticket?

ASSISTANT: Sure, please share your itinerary dates.

USER: Sure, my preferable dates of journey are from 02/19 to 02/21.

ASSISTANT: Please wait for a moment, let me check for any available flights.

USER: Sure, take your time. I need a flight with single connection.

ASSISTANT: Sorry Adams, I could not find a flight with single connection.

USER: No problem, thank you for your help.

ASSISTANT: Thank you for contacting us.