You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to visit Olympic National Park at Washington, could you please help me with booking a flight ticket from OAK to IAD?

ASSISTANT: Can you share your trip dates?

USER: I would like to depart on June 12th and return on June 14th.

ASSISTANT: Do you have connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: What class are you looking for?

USER: I am looking for a economy class ticket.

ASSISTANT: Are there any other preferences?

USER: Make sure that my depart time must be morning.

ASSISTANT: May I know your name?

USER: I am Paul Clark.

ASSISTANT: Sorry to say that, there is no flight found with your details.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.