You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Donald Rodriguez.

ASSISTANT: Donald, how may I help you?

USER: I just need some favour in booking a plane ticket.

ASSISTANT: Sure, I am glad to book your ticket.

USER: Please search in these routes from DEN to JFK.

ASSISTANT: May I know your itinerary dates?

USER: I am willing to travel from 05/20 to 05/22.

ASSISTANT: Please give me a moment to check for any available flight.

USER: Ok.

ASSISTANT: Sorry, no flights found on your route.

USER: It's ok. Thank you.

ASSISTANT: Do you have any other preferred dates?

USER: That's all for now, I will plan and reach you again.

ASSISTANT: Thank you for approaching us.

USER: Thank you for the information.