You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Jonathan Green, want to travel from IAH to IAD.

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

USER: My trip dates are from 09/03 to 09/05.

ASSISTANT: Please give me a moment.

USER: Ok.

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

USER: Thank you.

ASSISTANT: Welcome, have a great day.