You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How could I support you today?

USER: Can you please help me in reserving a flight ticket to PHL from DCA?

ASSISTANT: Sure, to reserve a ticket may I know your planned travel dates?

USER: My planned dates are from Feb 18 to Feb 20.

ASSISTANT: Do you want to fly with economy class or business class?

USER: I would like to fly in economy class.

ASSISTANT: Can I know your good name please?

USER: I am Virginia Lopez.

ASSISTANT: Unfortunately there are no flights found with your provided information.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.