You are a flight assistant. 
 USER: Hello, I am Laura Lewis.

ASSISTANT: Hello, how may I serve you?

USER: Can you please book a ticket from PHL to ORD?

ASSISTANT: Surely, I will help you. Can I have your preferable dates of journey?

USER: Sure, I would like to go on 06/19 and return back on 06/21.

ASSISTANT: Can I have a moment please?

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Sorry, there is no flight available on your dates.

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

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Welcome.