You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to attend a live concert held at DEN. So, can you help me with booking from DFW?

ASSISTANT: Sure, can I know your travel dates?

USER: Yes, my trip dates are May 16 and May 18.

ASSISTANT: Sure, may I know your class preference?

USER: I am ok with any class.

ASSISTANT: Ok, may I know your name?

USER: My name is Jennifer Roberts.

ASSISTANT: Thank you. Please wait for a while, let me check for the available flights.

USER: Ok.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: That's fine, thank you for the response.

ASSISTANT: You are welcome and thank you for choosing us.