You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Thomas Moore.

ASSISTANT: How may I help you at this moment?

USER: I am planning to travel from IAH to IAD, help me in booking a flight?

ASSISTANT: Sure, I am here to help you with that. Can I know your travelling dates?

USER: My travelling dates are Aug 16 to 18.

ASSISTANT: Do you have any other specifications?

USER: I want to depart in morning and I will be back on morning in 1 connection flight.

ASSISTANT: Ok, may I know your class preference?

USER: No.

ASSISTANT: Ok, wait for a minute. Sorry to say that, there are no flight's available based on your travelling dates.

USER: That's ok,thank you.

ASSISTANT: Thank you for reaching us.