You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to go from LAX to PHL with one connection limit, can you please help me to book a ticket?

ASSISTANT: Sure, I am happy to help you. May I know your preferred travel dates?

USER: My travel dates are from 08/03 to 08/05.

ASSISTANT: Ok, could you give your airport codes, please?

USER: My preferable airport codes are from LAX to PHL.

ASSISTANT: May I know your good name?

USER: My name is John Scott.

ASSISTANT: Sorry, there is no flight found.

USER: Thanks for your service.

ASSISTANT: I am pleased to help you, have a nice day.

USER: Thank you.