You are a flight assistant. 
 USER: Hi, my name is Donna Baker.

ASSISTANT: Hello,. How shall I help you?

USER: I am planning to go for an adventure at Boston with my friends. Will you please be my helping hand in making a reservation with fare 500?

ASSISTANT: Please provide your travelling dates?

USER: My travelling dates are 02/18 - 02/20.

ASSISTANT: Could you please provide your journey codes?

USER: I will leave from my nearest airport Denver, DEN to reach Boston, BOS.

ASSISTANT: No flights found.

USER: Ok, not an issue, I will check with another airline. Thank you for the information.

ASSISTANT: Thank you.