You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Charles Martin here.

ASSISTANT: Nice to meet you Charles.

USER: I want to book a ticket for attending my friend marriage, hope your helping me on that.

ASSISTANT: Sure, I am here to assist you. Which dates you are planned for the trip?

USER: I would like to travel on 02/11 to 02/13.

ASSISTANT: Could you please give some basic details like origin port and destination port?

USER: My source and destinations are from DEN to MSP.

ASSISTANT: Sorry Charles, I cannot find any flight with your details.

USER: Ok, Thank you for your help.

ASSISTANT: it's my pleasure.