You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight on June 25th?

ASSISTANT: Sure, let me know your airport codes?

USER: I will board from IAD to land DFW.

ASSISTANT: Can you mention your arrival date?

USER: I will be reaching back on June 27th.

ASSISTANT: Are there any requirements you need for the journey?

USER: Please look a flight which has not more than one connection.

ASSISTANT: Ok, may I know your name to proceed further?

USER: My name is Sarah Lopez.

ASSISTANT: Sorry, no flights found as per your request.

USER: No problem, thank you.

ASSISTANT: Thank you for contacting us.