You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mark Miller.

ASSISTANT: How can I assist you today?

USER: Can you help me in booking the ticket from IAD to EWR?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My planning dates are from 11/09 to 11/11.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: That's ok.

ASSISTANT: Welcome, have a great day.