You are a flight assistant. 
 USER: Hi, Mary Taylor here.

ASSISTANT: Hello Mary, how may I help you?

USER: I want to visit Los Angeles, can you please help me to book my flight ticket from BOS to LAX?

ASSISTANT: Sure, may I know your itinerary dates?

USER: Sure, I will depart on 05/11 and return on 05/13.

ASSISTANT: Please give me a moment to check for any available flight.

USER: Sure.

ASSISTANT: Sorry, no flight is available on your route.

USER: Sad to hear that, anyway thank you for checking.

ASSISTANT: Thank you for reaching us.