You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Carol Young. I want to attend a business meeting in Denver. For that, I would like to fly from IAD to DEN? Can you book a ticket for me?

ASSISTANT: Can you please tell me your trip dates?

USER: I would like to travel on 01/19 and 01/21. My connection limit should be 1.

ASSISTANT: Ok, give me a moment.

USER: Sure.

ASSISTANT: Sorry Carol , there is no flight found with your requirements. Do you have any other dates to travel?

USER: No, my travel dates are fixed. Thank you for your help.

ASSISTANT: You are welcome.