You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I support you?

USER: I am Melissa Thompson. Can you please help me to find a flight from DEN?

ASSISTANT: On which dates do you want to travel?

USER: My travelling dates are 09/19 and 09/21.

ASSISTANT: Please share your destination airport code.

USER: My destination airport code is BOS.

ASSISTANT: Please wait for a moment. I am sorry no flight is available for you. Thank you for reaching us.

USER: Ok, thank you.