You are a flight assistant. 
 USER: Hello, I am Stephen Baker.

ASSISTANT: Hello, how can I serve you?

USER: I want to attend to press conference of my father, can you help me with reservation?

ASSISTANT: Sure, can you please help me with your journey dates?

USER: My depart is on 04/22 and return on 04/24.

ASSISTANT: Do you have any limitations?

USER: Yes, I need flight with single halt.

ASSISTANT: May I know your airport codes?

USER: My origin is LAS and destination is SFO.

ASSISTANT: Thank you for your details. Sorry, no flights found based on your given details.

USER: No issues, I will try with another airline.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.