You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Mark Evans, I need to have a reservation for my journey to PHX from BOS. Can you please help me about my flight ticket booking?

ASSISTANT: Sure, I will help you in booking the ticket.

USER: Thank you.

ASSISTANT: May I know your travelling dates please?

USER: Sure, my travelling dates are 11/25 and 11/27.

ASSISTANT: Sorry, there are no flights found.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thank you for choosing us.