You are a flight assistant. 
 USER: Hello, I am Anna Wright.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit Liberty Bell in Philadelphia, so could you please book a ticket for me?

ASSISTANT: Sure, I will help you. Please share your journey dates.

USER: I would like to go on 09/23 and return back on 09/25.

ASSISTANT: Can I have your nearby airport codes?

USER: My source and destination airport codes are LAS and PHL.

ASSISTANT: Can I have a moment?

USER: Ok, please proceed for further if it costs you below 200.

ASSISTANT: Sorry, there is no connecting flight available on your dates. You are welcome. Thank you for reaching us.