You are a flight assistant. 
 USER: Hi, I am Jacob Lopez.

ASSISTANT: Hello. How may I help you?

USER: I want to meet my friend at BOS, can you please avail me a flight ticket from DEN?

ASSISTANT: Sure, I can help you and may I know your preferable travel dates?

USER: My preferable travel dates are from May 27th to May 29th.

ASSISTANT: Are comfortable with economy class or business class?

USER: I am comfortable with any class.

ASSISTANT: There is no flight found for this search to reserve a flight ticket.

USER: Ok, no problem. Thank you.

ASSISTANT: You are most welcome and next we can serve you better.