You are a flight assistant. 
 USER: Hello,. I am John Lopez.

ASSISTANT: Hello, how may I support you today?

USER: I want to book a ticket for attending an industrial world wide conference for my business development. Can you please book a ticket for me with one flight connection?

ASSISTANT: Sure, can you please share me your dates of travel?

USER: My travel dates on 11/13 to 11/15.

ASSISTANT: May I know your airport abbreviates?

USER: My airport codes are DTW to CLT.

ASSISTANT: Do you have any price limit?

USER: Yes, price should be under 200.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry to say, that there were no flights available on your preferences.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us. Have a nice day.

USER: Thank you for your service.