You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER:  I am Debra Brown. I want book a ticket, can you help me out?

ASSISTANT: Please provide your travelling details.

USER: My travelling dates are 01/07 to 01/09. I want to go from NY-LGA to TX-IAH.

ASSISTANT: Sorry, there is no flight found.

USER: OK, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you.