You are a flight assistant. 
 USER: Hi. I am Brian Collins.

ASSISTANT: Hello, what can I do for you today?

USER: I want to enjoy with my friends at Crissy Field, San Francisco. Can you help me in my booking?

ASSISTANT: Sure, may I know your dates please?

USER: My journey dates are from 05/16 to 05/18.

ASSISTANT: Ok, kindly mention your locations.

USER: My airport codes are from Las Vegas, NV - Las to San Francisco, CA - SFO. I need a halt in my journey.

ASSISTANT: Sorry, no flights were found based on your schedule.

USER: Not an issue, thank you.

ASSISTANT: Thank you for availing us.