You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Andrew Collins.

ASSISTANT: How may I help you now?

USER: I want to book  a flight ticket to visit 16th street mall to buy accessories for my sister's marriage at CO-DEN.

ASSISTANT: Ok, please mention your travel dates?

USER: 11/11 and 11/13 are my preferable travelling dates.

ASSISTANT: Ok, mention your origin airport code?

USER:  I would like to start from NC-CLT.

ASSISTANT: Sorry, no flights are available with your criteria.

USER: No issue.

ASSISTANT: Thanks for reaching us, have a nice day.

USER: Thank you for your service.