You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assess you?

USER: I am Pamela Phillips. I planned to meet my friends in PHL, can you please help me to book a flight ticket from LAS?

ASSISTANT: Yes, can you please provide your preferable trip dates?

USER: I prefer to travel on 06/22 and 06/24.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there are no flights found on the travelling dates that you have provided when I search in our data base.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for your information.

ASSISTANT: Welcome.