You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to book a ticket from HOU to SFO, can you please help me out?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: I am travelling on these dates Jan 12th and 14th.

ASSISTANT: Do you have any connection limit?

USER: I need a single connected flight.

ASSISTANT: Ok, may I know your arrival and departure time?

USER: I don't have time preference.

ASSISTANT: Ok, do you have any other specifications?

USER: I prefer normal-cost airline.

ASSISTANT: Before searching the flight, please provide me your name for documention purpose.

USER: John Walker here.

ASSISTANT: Sorry, no flights are available on your route.

USER: Ok no problem, thank you for your services.

ASSISTANT: Welcome, have a nice day.