You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Barbara Thompson here.

ASSISTANT: How may I address you today?

USER: I would like to book a ticket from DEN to ORD, can you please help me with that?

ASSISTANT: Sure, I'll help you in booking. Please let me know your fare preference.

USER: Price limit should be 500.

ASSISTANT: Could you please let me know if you need a connecting flight?

USER: I want a direct flight.

ASSISTANT: Kindly share your scheduled travelling dates to proceed further.

USER: The travel dates are from 11/22 to 11/24.

ASSISTANT: Ok, please wait a while I will check and revert to you.

USER: Ok.

ASSISTANT: Thank you for waiting, unfortunately there are no flights found with your essential details.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for choosing us.