You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Rachel Lopez. I am planning to travel from ORD to DTW.

ASSISTANT: Sure, please mention your travelling dates to go.

USER: My travelling dates are 07/21 to 07/23.

ASSISTANT: Ok, wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight available on your route to book your ticket.

USER: That's ok, thank you for your help.

ASSISTANT: Thanks for consulting us.