You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Andrew Thomas. Please book me a ticket from SEA to DCA to meet my family.

ASSISTANT: Sure, I am gleeful to help you. Could you please provide your travelling dates to search for the flight?

USER: I have planned to travel on June 28th and return on June 30th.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I have planned to depart at afternoon time and return at evening time.

ASSISTANT: Do you have any class or connection preferences?

USER: I prefer connecting flight.

ASSISTANT: Sorry, no flight is available for you as per your requests.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.