You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best can I serve you?

USER: I have planned to purchase ticket from HOU to SFO, can you assist me in booking my ticket.

ASSISTANT: Sure, when are you planning to start and return on?

USER: I have planned my trip on Jan 2nd and return Jan 4th.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I need one connection between my trip.

ASSISTANT: Do you need any other specifications?

USER: Yes, I want to return back on afternoon.

ASSISTANT: Can I know your good name?

USER: Raymond Roberts here.

ASSISTANT: There are no flights found with given details.

USER: No problem, thank you for helping me.

ASSISTANT: Thank you.