You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Could you book my ticket in a connecting flight?

ASSISTANT: Sure, I will help you. May I know with your name, please?

USER: Jennifer Allen here.

ASSISTANT: Please help me with your planned travel dates.

USER: I want to travel on Sept 21 and Sept 23.

ASSISTANT: Please let me know with your depart and arrival airport codes.

USER: I want to travel from AUS to SEA.

ASSISTANT: Please help me with your preferred class to fly.

USER: I prefer economy class.

ASSISTANT: Jennifer Allen, do you have any other preferences in your journey?

USER: No.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: I highly regret to inform you that there are no flights available for your journey.

USER: No problem, thank you.

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