You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I'm Rebecca Jackson.

ASSISTANT: Ok.

USER: I want to surprise my best friend, as a sudden visit.I want to book a ticket.

ASSISTANT: Sure, will you provide your airport codes?

USER: My airport codes are from LAX to LAS.

ASSISTANT: Please provide your travelling dates.

USER: My trip dates are from 10/16 to 10/18.

ASSISTANT: Unfortunately there is no flights found under your details.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.Have a great day.