You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Sandra Hall. Can you help me in booking my flight ticket from PHL to LAS?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your depart date and arrival date?

USER: My depart date is Sep 26, my return date is Sep 28.

ASSISTANT: Do you have any other specifications?

USER: I need a economy class.

ASSISTANT: Please, wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, there were no flights available that matches your requirements.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.