You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I help you?

USER: Please book a ticket from New York, NY-EWR to Washington DC-DCA.

ASSISTANT: Sure, please share me your travelling dates?

USER: My departure date is 04/29 and 05/01 is my return date.

ASSISTANT: Thanks for your details. Sorry, there are no flights with your specifications.

USER: Thanks for the help.

ASSISTANT: Can I know your name?

USER: I am Emily Johnson.

ASSISTANT: Thank you for reaching us.