You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I need to book a flight ticket from SEA to DFW, can you help me in booking a flight ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, my journey dates are May 24 and May 26.

ASSISTANT: Do you have any specifications?

USER: I prefer maximum one connection. And I want to fly in a economy class.

ASSISTANT: May I know your name?

USER: Sure, Mark Phillips here.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your preferred travel dates.

USER: Ok, no worries at all. Thank you for your assistance.

ASSISTANT: Thank you.