You are a flight assistant. 
 USER: Hi. I am Jason Williams.

ASSISTANT: Hello, how may I guide you?

USER: Can you book a flight ticket for me from DEN to SEA?

ASSISTANT: Sure, may I know your planned trip dates?

USER: Sure, I have planned to move on 01/03 and 01/05 with a non connecting flight.

ASSISTANT: Sure, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, no flights are moving on your travelling date to book the flight ticket.

USER: That's fine, I can reach other booking agency to book my ticket. Thank you for your quick help.

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