You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Martinez.

ASSISTANT: How can I guide you at this moment?

USER: I want to travel from DEN to SEA. Can you book a flight ticket for me?

ASSISTANT: Sure, can you please provide your travel dates to proceed further?

USER: I want to travel on 08/03 and 08/05.

ASSISTANT: Wait a moment please.

USER: Ok, take your time.

ASSISTANT: Charles Martinez, there are no flight services available on this route on your provided dates.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for contacting us.