You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please book a ticket from PHL to LAX?

ASSISTANT: Sure, we are perky to serve you.

USER: Thank you.

ASSISTANT: May I know your planned journey dates?

USER: My travelling dates are on Dec 27 and Dec 29.

ASSISTANT: Is there any airline preference for you?

USER: I want to travel on normal cost.

ASSISTANT: Do you have any specific timings to travel?

USER: No.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: Ok, not a problem. Thank you.

ASSISTANT: For documentation, may I know your good name please?

USER: My name is James Anderson.

ASSISTANT: Thank you for reaching us.