You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know how best I can help you today?

USER: Sharon Thomas here. I would like to book a ticket from ORD to IAH, can you please help me with that?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: The travel dates are from 04/24 to 04/26.

ASSISTANT:  Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

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

ASSISTANT: Thank you.