You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is John Miller.

ASSISTANT: How may I assist you?

USER: I would like to visit Philadelphia to meet my cousin. Can you help me in booking a ticket from DCA to PHL?

ASSISTANT: Sure, when would you like to plan your journey?

USER: My preferred trip dates are 02/14 and 02/16.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: John, no flights has been found on your journey dates.

USER: It's ok, no issues. Thank you for the information.

ASSISTANT: Thank you for approaching us.