You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me to book a flight from PHL to LAX?

ASSISTANT: Sure, may I know the travelling dates?

USER: I want to travel on Sept 19 and need to return on Sept 21.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a flight with single connection.

ASSISTANT: Are there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: I am George Hall.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, no flights found with your chosen dates.

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: Thank you for opting us.