You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anna Harris.

ASSISTANT: How can I help you?

USER: Can you please help me in booking a flight ticket from BOS to DCA?

ASSISTANT: Let me know your travelling dates.

USER: I want to fly on May 26 and return on May 28.

ASSISTANT: Do you have any preference?

USER: Yes, I would like to depart in morning time.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Not an issue.

ASSISTANT: Thank you.

USER: Thank you for your information.