You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How may I help you today?

USER: Please provide a ticket from Dallas & Fort Worth, TX-DFW to Los Angeles, NV-LAS.

ASSISTANT: Sure, may I know your trip dates please?

USER: Depart is by 02/25 and 02/27 is return date.

ASSISTANT: May I know your name please?

USER: I am Ruth Thompson.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, there are no flights found with your specifications.

USER: Thanks.

ASSISTANT: Thank you for reaching us.