You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I would like to book a flight ticket from ORD to LAS, can you help me with that?

ASSISTANT: Sure, may I know your travel dates?

USER: My trip dates are 05/02 and 05/04.

ASSISTANT: Do you have any class preference?

USER: I need a connecting flight in economy class.

ASSISTANT: Could you like any other requirements?

USER: I prefer normal cost airlines.

ASSISTANT: Ok, can you share your name please?

USER: I am George Thompson, my Depart time must be in morning and return time should be in evening.

ASSISTANT: Sorry, no flights found as per your request.

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

ASSISTANT: Thank you for contacting us.