You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to book a flight from SFO to LAS?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Let me know your travel dates please.

USER: My travel dates are Dec 3rd and 5th.

ASSISTANT: Please share me your name to proceed further.

USER: My name is Stephanie Martinez.

ASSISTANT: Ok, do you have any class preference?

USER: I prefer to fly in economy class.

ASSISTANT: Are you looking for a connecting flight?

USER: I am fine with a connecting flight.

ASSISTANT: Please wait for a moment, I will get back to with the availability.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight available on your route.

USER: No problem, thank you for your time.

ASSISTANT: Thank you for choosing us.