You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Angela Mitchell. Can you please book a ticket from 07/21 to 07/23 for conference meeting?

ASSISTANT: Sure, Please help me with your journey codes.

USER: Sure, my journey codes are from DFW to LAS.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for availing us.