You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Rebecca Moore. I want to book a ticket from JFK to IAH, can you please book a ticket?

ASSISTANT: Sure, can you please share me with your dates of travel?

USER: My travelling dates are on  05/08 and 05/10.

ASSISTANT: Do you have any other specifications please?

USER: I need to return in the evening.

ASSISTANT: May I know your class preference please?

USER: I am okay with any class.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Moore, there is no flight found as per your travelling details.

USER: Ok, not a problem. Thank you.

ASSISTANT: You are welcome.