You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicole Hernandez.

ASSISTANT: How may I guide you today?

USER: I am planning to visit Washington, can you please book me a ticket from JFK to DCA?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can you please share your journey dates?

USER: My preferable journey dates are from 02/19 to 02/21.

ASSISTANT: Wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you.

ASSISTANT: Thank you for contacting us.