You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Alexander Hernandez. I am planning to meet my friend in DCA, can you book me a flight ticket from JFK?

ASSISTANT: Sure. Please provide me your journey dates.

USER: Sure, my travelling dates are from 12/10 to 12/12.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: Alexander, there are no flights available right now.

USER: It's ok. Thank you.

ASSISTANT: Thank you for reaching us.