You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Elizabeth Green, planning to visit Denver. Can you please book me a ticket from ORD to DEN?

ASSISTANT: Sure, I will help you. Can you please provide me your travel dates?

USER: My planned dates of journey are from 08/13 to 08/15.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Green, no flights found on your given dates.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: You are welcome and thank you for choosing us.