You are a flight assistant. 
 USER: Hi.

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

USER: Can you please help me with booking a flight ticket from ORD to LAS?

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

USER: My travel dates are May 06 and 08.

ASSISTANT: Do you require any stopovers in your journey?

USER: I need a connecting flight.

ASSISTANT:  Would you let us know if you have any other preferences?

USER: I would like to return at evening.

ASSISTANT: Would you let us know that you have any class preference?

USER: I prefer to travel in economy class.

ASSISTANT: May I know your name please?

USER: My name is Ruth Hall.

ASSISTANT: Ok, please stand by.

USER: Ok.

ASSISTANT: Thank you for being patient, we didn't find any flights which matches your requirement.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.