You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Michelle Martinez here. I would like to book a ticket from LAX to LAS, can you please help me with that?

ASSISTANT: Sure, may I know your travel dates?

USER: The travel dates are from 09/16 to 09/18.

ASSISTANT: At what time do you like to leave from LAX?

USER: I am ok with any time.

ASSISTANT: Sorry, there is no flight on your details.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for choosing us.