You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Please help me in booking a flight ticket in my preferable travel dates July, 18 and July, 20.

ASSISTANT: Sure, can you share your airport codes?

USER: SEA and PHL are my specific airport codes.

ASSISTANT: Do you have any connection limit?

USER: I would prefer single connection.

ASSISTANT: Is there any class preference?

USER: No, thanks.

ASSISTANT: Are there any other specifications?

USER: No.

ASSISTANT: Please forward your name.

USER: Jacob Mitchell here.

ASSISTANT: Sorry, there are no flights found on your specified trip dates.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you.