You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?>.

USER: I am Melissa Perez. I am planning to book a ticket from PHX to LAS. Can you please help me out?

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates?

USER: I am planning to travel on Nov 23 and return back on Nov 25.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: That's fine, thank you for your service.

ASSISTANT: Thanks for approaching us.