You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from OAK to DCA to attend seminar, can you help me in booking?

ASSISTANT: When are you planning your trip?

USER: I am departing on Mar 25 and return on Mar 27.

ASSISTANT: May I know your name please?

USER: My name is Samantha Adams.

ASSISTANT: Is there any other specification's regarding your journey?

USER: I do not have any other specifications.

ASSISTANT: Do you have any other criteria?

USER: I do not have any requirements.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you very much for contacting our agency.