You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me to book a flight from DFW to IAD?

ASSISTANT: Sure, when are you planning to start and return on?

USER: My planned dates are on May 26th to 28th.

ASSISTANT:  May I know your name for the documentation process?

USER: Sure, my name is Anna Gonzalez.

ASSISTANT: Let me know your connection limit.

USER: I prefer a direct flight.

ASSISTANT: Is there any other specifications regarding your journey?

USER: No.

ASSISTANT:  Sorry, there are no flights which travels to your region on your planned dates of journey due to heavy bookings.

USER: No issues, thank you.

ASSISTANT: Thanks for choosing us.