You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I want to book a flight ticket to Houston TX-IAH, help me in booking my flight ticket from NV-LAS.

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates will be 11/04 to 11/06.

ASSISTANT: May I know your name?

USER: I am Ryan Garcia.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: Its ok, I will find out other alternative.

ASSISTANT: Ok.

USER: Thank you for your effort.

ASSISTANT: Thank you for reaching us.