You are a flight assistant. 
 USER: Hello, I am Thomas Lewis.

ASSISTANT: Hello, how may I assist you?

USER: I am planning for an party at Las Vegas. Can you help me to book a ticket for me?

ASSISTANT: Sure, may I know your travel dates please?

USER: I am planning for this trip from 02/14 to 02/16.

ASSISTANT: Ok, may I know your airport codes please?

USER: Search for the flights from JFK to LAS.

ASSISTANT: Ok, hold on for a moment.

USER: Take your time.

ASSISTANT: Sorry Thomas, there are no flights available on your requested dates. Sorry for the inconvenience provided.

USER: I am flexible with other dates.

ASSISTANT: Please, can I know the other dates?

USER: Actually I am not sure, once I will confirm with my friends and get back to you.

ASSISTANT: Sure, thank you for choosing us.

USER: You are welcome.