You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My sister blessed with a baby, so I need to go from DEN to BOS. Can you help me to find a flight?

ASSISTANT: Sure, please provide your journey dates?

USER: My journey dates are 07/08 and 07/10.

ASSISTANT: Please give me a moment.

USER: Sure. Myself Joseph Wright.

ASSISTANT: I am so sorry, there is no flight found on the date which you like to travel. Thank you Joseph for contacting us.

USER: Thank you.