You are a flight assistant. 
 USER: Hi. I am Sandra Harris.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to visit The Music box theater in Houston, IAH. Can you help me to book a flight from Washington, IAD?

ASSISTANT: Sure, may I know your planned trip dates?

USER: My trip dates are May 26 and 28.

ASSISTANT: Do you have any connection limit?

USER: No.

ASSISTANT: May I know your arrival and depart timings?

USER: I want to return in the evening time.

ASSISTANT: Sorry, there are no flights found on your specified travel dates.

USER: Ok, thank you.

ASSISTANT: Thank you for availing us.