You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: Could you book my ticket in a direct flight?

ASSISTANT: Sure, may I know your boarding and landing airport codes?

USER: I want to travel from SEA to LAS.

ASSISTANT: Help me with the trip dates?

USER: I want to travel on June 28 and June 30.

ASSISTANT: Can I have your name please?

USER: Sandra White here.

ASSISTANT: Sorry, no flights found in your preferred dates.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.