You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Carolyn Clark, want to travel from LGA to IAH. Please help me in booking.

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My travelling dates are from 07/17 to 07/19.

ASSISTANT: Sorry, there is no flight available on your requested dates.

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

ASSISTANT: Thank you for approaching us.