You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking my flight ticket from PHL to LGA?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are Apr 28 and Apr 30.

ASSISTANT: Can I know your good name?

USER: Mark Jackson is my name.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Sorry, there are no flights available on your request.

USER: Thanks for your information.

ASSISTANT: Thank you for choosing us.