You are a flight assistant. 
 USER: Hello. I am Carol Young.

ASSISTANT: Hello, How can I aid you?

USER: I am planning to go for a shopping in Barton Creek Square at San Francisco. Can you book me a ticket in the evening?

ASSISTANT: Sure, May I know your travelling dates?

USER: My departure is on Jan 19 and arrival is on 21.

ASSISTANT: From where you want to start your journey?

USER: I would like to leave from PHL.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need single stop over.

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

USER: That's fine, thanks for your response.

ASSISTANT: Thank you.