You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Patrick Johnson here.

ASSISTANT: How may I assist you?

USER: I am looking for a flight with price below 200. Can you book it?

ASSISTANT: Patrick Johnson, please mention your travelling dates with me.

USER: My travel dates are 01/08 to 01/10.

ASSISTANT: Ok, may I know your desired airport codes please.

USER: My airport codes for boarding the flight are DEN to CLT.

ASSISTANT: Sorry Johnson, no flights are available.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching our agency, have a great day.