You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you for today?

USER: I am planning to visit a Chicago from DEN to ORD. Can make a reservation for me?

ASSISTANT: Yes, I am here to help you about that. Can you please help me with your planned dates of journey?

USER: Sure, my planned trip dates 03/31 and 04/02.

ASSISTANT: On whose name shall I book this flight ticket?

USER: Yes, the previous reservation is done under the Brenda Phillips.

ASSISTANT: I regret to say this, there is no flights as per your planned dates of journey Phillips.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: My pleasure, thank you for reaching out here. Hope you have a nice day.