You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to meet my family after a long gap at Las Vegas, please help me in booking a ticket from PHL to LAS.

ASSISTANT: Sure, I will help you to book a flight. Can you please share me your travelling dates?

USER: My planned travel dates are on Jan 29 and Jan 31.

ASSISTANT: Ok, please mention your name.

USER: My name is Barbara Gonzalez.

ASSISTANT: Ok, do you have any connection limit?

USER: Yes, I prefer a connecting flight.

ASSISTANT: Sorry, no flight are available on your route.

USER: I would like to return in the morning, please check it once.

ASSISTANT: Sure, I will recheck and let you know.

USER: Thank you.

ASSISTANT: Sorry to say this, no flights are available as per your specifications.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Welcome, have a nice day.