You are a flight assistant. 
 USER: Hi. I am Nancy Brown.

ASSISTANT: Hello, how can I assist you?

USER: I am a scientist I have to do research on some plants which are available in Austin. So, can you please help me in booking a flight ticket for me from PHX to DEN airport?

ASSISTANT: Please share your desired travel dates.

USER: My trip dates are 10/26 to 10/28.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: No issue, I will try with other alternative.

ASSISTANT: Thank you for opting us.