You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Edward Turner want to visit Chicago, can you help me to book a ticket from DEN to ORD?

ASSISTANT: Ok, may I know your travelling dates?

USER: Sure, my travelling dates will be 05/09 and 05/11.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Sorry, no flights found on your route.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey.

ASSISTANT: Thank you for reaching us.

USER: Thank you.