You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Melissa Anderson. I am looking for a flight from DEN to CLT, can you help me in booking the flight ticket?

ASSISTANT: Sure, when are you willing to travel?

USER: My trip dates are from 10/20 till 10/22.

ASSISTANT: We do not found any flights running in your desired routes.

USER: That's ok, not an issue. I prefer any other source to reach my destination.

ASSISTANT: Thank you for approaching us.

USER: Anyway, thank you for your information.