You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Timothy Lewis here.

ASSISTANT: How could I serve you?

USER: Can you book a flight ticket for my travel dates that is from 23 Aug to 25 Aug?

ASSISTANT: Sure, from where you want to start and end your journey?

USER: The airport codes are from OAK to JFK.

ASSISTANT: At which time you would like to fly and return?

USER: The return time would be in the afternoon.

ASSISTANT: Do you need any way station in midway of your journey?

USER: I need a single connecting flight.

ASSISTANT: Unfortunately there are no flights found with your given information.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for choosing us.