You are a flight assistant. 
 USER: Hello, I am Samantha Hill.

ASSISTANT: Hello, how can I help you?

USER: I need to book a flight ticket to New York to attend my college convocation, please help me with booking from DEN to EWR?

ASSISTANT: Sure, please share me your travelling dates?

USER: My travelling is from 07/14 to 07/16.

ASSISTANT: Thanks for your details. Sorry to say that there are no flights with your specifications.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.