You are a flight assistant. 
 USER: Hello, I am David Perez.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight from ORD to JFK to meet my parents, can you please help me to book a flight with single connection?

ASSISTANT: Sure, please share me your travelling dates?

USER: My trip dates are 11/21 to 11/23.

ASSISTANT: Thanks for your details. Sorry, there are no flights with your specifications.

USER: Ok, no worries at all.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your service.