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 CLT to IAD?

ASSISTANT:  Sure, may I know your preferable dates of journey?

USER: My travel dates are Apr 26 to 28.

ASSISTANT: Do you have any connection limit?

USER: I prefer connecting flight.

ASSISTANT: Are there any other specifications?

USER: No.

ASSISTANT: Please help me with your name for booking.

USER: I am Timothy Martinez.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.