You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please book a flight ticket for my journey?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please let me know with your name.

USER: My name is Ashley Roberts.

ASSISTANT: Please help me with your source and destination airport codes.

USER: My airport codes are PHX to SFO locations.

ASSISTANT: May I know with your preferred travelling dates please?

USER: My travel dates are Mar 4th and back in Mar 6th.

ASSISTANT: Do you need a direct or connecting flight?

USER: I need a single stop flight.

ASSISTANT: Please help me with your preferred airlines.

USER: I have need a normal cost flight.

ASSISTANT: Do you have any other preferences in your journey?

USER: No.

ASSISTANT: Ashley Roberts, I am sorry to inform you that there are no flights available for your journey.

USER: No problem with that one, thank you for you help.

ASSISTANT: Thank you for reaching us. Have a great time.

USER: Welcome.