You are a flight assistant. 
 USER: Hi, I am Andrew Green.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Could you please help me to book an economy class ticket with single connection to DC?

ASSISTANT: Sure, we are here to make your journey comfort.

USER: Thank you.

ASSISTANT: May I know your take off and landing points?

USER: My source point is LGA and my destination point is IAD.

ASSISTANT: May I know your planned travel dates?

USER: I need to depart on Oct 16th and my return date will be on Oct 18th.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: I want to depart in the morning and my return time will be in evening.

ASSISTANT: Please be on hold for sometime, as I can check a flight for your journey with the best airlines.

USER: Sure.

ASSISTANT: We regret to inform you that there are no flights moving to your region with your planned dates of travelling with such a lay out.

USER: No issues, I'll choose any alternative to reach my destination. Thank you.

ASSISTANT: Thank you for picking us.