You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: I am Jacob Mitchell here. I want to reserve my ticket from BOS to LAS, can you please help me out?

ASSISTANT: Sure, May I know the journey dates?

USER: Sure, my planned dates of journey are from Jul, 18 to Jul, 20.

ASSISTANT: Please wait a minute.

USER: Sure, but I need a connecting flight.

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

USER: Ok, that's fine. Thank you for your service.

ASSISTANT: Thank you for opting us.