You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a book a direct flight to Denver to attend a business meeting, can you please help me in booking?

ASSISTANT: Sure, may I know your airport codes?

USER: My boarding and landing airport codes are ORD and DEN.

ASSISTANT: Ok, let me know your journey dates?

USER: I would like to start on July 8th and my return date will be on July 10th.

ASSISTANT: Ok, can you share me your good name?

USER: I am Raymond Nelson.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, there are no flights found with your requirements.

USER: No issues, I'll choose any alternative to reach my destination. Thank you.

ASSISTANT: Thank you for reaching us.