You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Barbara Thomas, want to travel from IAH to DTW.

ASSISTANT: Sure, please share your travel dates.

USER: My travelling dates are from 10/27 to 10/29.

ASSISTANT: Sorry, No flights available.

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

ASSISTANT: Thank you.