You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to return in the evening. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, let me know your airport codes?

USER: My airport codes are PHL and OAK.

ASSISTANT: Ok, on which dates are you planning to travel?

USER: My travelling dates are June 22 and June 24.

ASSISTANT: Is there any class preference?

USER: Yes, I prefer to travel in a economy class.

ASSISTANT: Do you want to fly in any specific airline?

USER: No.

ASSISTANT: Would you like any lay off in your journey?

USER: I need a break in between the journey.

ASSISTANT: Ok, can you mention your name to proceed further?

USER: I am Kimberly Thompson.

ASSISTANT: Sorry, no flights found as per your requirement.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for contacting us, hope to serve you better in future.