You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Thomas Carter.

ASSISTANT: How can I help you today?

USER: I need a flight from  IAH to LAS, can you help me out please?

ASSISTANT: Please share your trip dates.

USER: My trip dates re from 07/19 till 07/21.

ASSISTANT: Sorry, no flights are available for you on your route.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Welcome, have a nice day.