You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Mark White here. I want to participate in Boston marathon, so please book my ticket from SEA to BOS.

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

USER: My itinerary dates are May 26 and May 28.

ASSISTANT: Do you have any other requirements?

USER: I want to return in the afternoon.

ASSISTANT: May I know your class preference please?

USER: I am comfortable in any class. I need a connecting flight.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight found as per your travelling details.

USER: No problem, thank you.

ASSISTANT: You are welcome.