You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Samantha Thompson, want to travel from LGA to DCA. Please help me in booking my ticket.

ASSISTANT: On which dates you are planning to travel?

USER: I want to travel from 04/12 to 04/14.

ASSISTANT: There is no flights available.

USER: It's ok, thank you.

ASSISTANT: Most welcome.