You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Betty Evans, I want to book a flight from IAD to LAX. Can you help me with booking?

ASSISTANT: Sure, may I know your travelling dates?

USER: I will fly on June 19 and return on June 21.

ASSISTANT: Can I know your flight timings?

USER: I want my return flight in afternoon.

ASSISTANT: Do you have any class preference?

USER: Yes, I want a economy class airline.

ASSISTANT: We could not find any flights available on your request.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.