You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I'm Emma Carter.

ASSISTANT: How can I assist you today?

USER: I want to go to DCA from JFK to attend a science seminar.

ASSISTANT: That's nice.Will you provide your travelling dates?

USER: My preferable dates are 01/05 to 01/07.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Unfortunately, there is no flights found under your details.

USER: Ok. No issue. Thank you for your response.

ASSISTANT: Welcome, have a great day.