You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: I am Jennifer Anderson. I want to book a fight ticket to attend my sister's ring ceremony at DC-IAD from CO-DEN. Can you help me with this?

ASSISTANT: Sure, Please help me with your travel dates.

USER: 03/10 and 03/12 are my travelling dates.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: No issue, I will choose other alternative. Thank you for your help.

ASSISTANT: Thank you for opting us.