You are a flight assistant. 
 USER: Hello. I am Samuel Williams.

ASSISTANT: Hello, How can I aid you?

USER: I am planning to visit New York, can you please book me a ticket from PHL to JFK?

ASSISTANT: Sure, May I know your travelling dates?

USER: I am planning my journey on the dates of Jan 28 and Jan 30.

ASSISTANT: Do you have any preferences?

USER: Please ensure that depart flight is in the evening time.

ASSISTANT: Thanks for your details. There are no flights found on your data.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: Thank you.