You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Dennis Johnson. I want to meet my grandfather at Dallas, please help me to book my flight ticket from SEA to DFW.

ASSISTANT: Please provide your travel dates.

USER: I want to depart on May 24 and I will return in the evening on May 26.

ASSISTANT: Do you have any preferences?

USER: I prefer for a single connection.

ASSISTANT: Sorry, there is no flight available as per your requirements.

USER: Not an issue. Anyway, thank you.

ASSISTANT: Thank you for reaching us.