You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to visit Philadelphia, can you please book me a ticket from LAS to PHL?

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

USER: My planned dates of journey are July 10 and July 12.

ASSISTANT: Ok, please mention your name.

USER: My name is William Clark.

ASSISTANT: Ok, do you have any connection limit?

USER: I prefer connecting flight for this trip.

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

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Welcome, have a nice day.