You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Stephanie Martin.

ASSISTANT: How can I oblige you?

USER: I wish to go for a lake mead tour with my friends at Las Vegas, can you please help me in booking a ticket with connecting flight?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: May I know your trip dates?

USER: My trip dates are from 12/19 to 12/21.

ASSISTANT: To proceed booking I need your airport codes.

USER: I will leave from New York, EWR to reach Las Vegas, LAS.

ASSISTANT: Please, wait.

USER: Ok.

ASSISTANT: Thanks for waiting, there were no flights found on your given requirements.

USER: It's ok. Thank you.

ASSISTANT: Thank you.