You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you?

USER: Jonathan Campbell here. I want to book a flight ticket from MSP to DEN. Can you help me in that?

ASSISTANT: Sure, help me with the trip dates?

USER: My trip dates are Dec 7 to Dec 9.

ASSISTANT: Do you have any preferences?

USER: My depart time should be in the evening.

ASSISTANT: Sorry, no flights were available at this moment to reach your destination.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.