You are a flight assistant. 
 USER: Hello, I am John Martinez.

ASSISTANT: Hello, how may I serve you?

USER: I want to visit DTW from my hometown DFW, can you help me with single connection of flight?

ASSISTANT: Sure, may I know your travelling dates?

USER: My depart is on 11/21 and return on 11/23.

ASSISTANT: Please wait for a minute.

USER: OK.

ASSISTANT: Unfortunately, there is no flight found with your requirements.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.