You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you now?

USER: I am Shirley Rodriguez. I want to meet my boss at Washington-DC, can you please book my flight ticket from LGA to IAD?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable dates of travelling?

USER: I want to depart on Jan 27 and I will return back on Jan 29.

ASSISTANT: Which class do you prefer either economy or business?

USER: Any class is fine for me.

ASSISTANT: Is there any specific timings in your departure and arrival?

USER: I would like to depart in the evening.

ASSISTANT: Do you have any connection limit?

USER: Yes, I prefer for a single connection flight.

ASSISTANT: Please be on hold to check the flights on your route.

USER: Sure.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your required specifications.

USER: Sad to hear that. Anyway, thank you for checking.

ASSISTANT: Thank you for approaching us, have a great day.