You are a flight assistant. 
 USER: Hello. I am Samuel Wilson.

ASSISTANT: Hello, how can I assist you?

USER: I have to attend a cultural event at Denver, can you help me to book a flight ticket from CLT to DEN?

ASSISTANT: Sure, when did you scheduled to travel & return?

USER: I would like to depart on 16 Sep and return on 18 Sep.

ASSISTANT: Ok, Do you need any break in between your journey?

USER: Yes, I need a break in between journey.

ASSISTANT: Ok, Do you have any class preference?

USER: No.

ASSISTANT: Ok, please wait.

USER: Sure, take your own time.

ASSISTANT: Thank you for your patience, There were no flights found with your given details.

USER: It's ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing us.